Mathematics High School

Review the proof of the identity cos(π − A) = −cosA.

cos(π − A)

Step 1: = cosπcosA − sinAsinπ

Step 2: = (−1)(cosA) + (sinA)(0)

Step 3: = −1cosA + (sinA)(0)

Step 4: = −cosA + 0

Step 5: = −cosA

At which step was an error made?

step 1
step 2
step 3
step 4

Review The Proof Of The Identity Cos( A) = CosA.cos( A)Step 1: = CoscosA SinAsinStep 2: = (1)(cosA) +

Answers

Answer 1

Answer:

error in step 1

Step-by-step explanation:

well where is does the step not make sense?

remember cos(pi) = -1 and sin(pi)=0

that means step 1 is strange... it didn't distribute properly

it should have been:

cos(pi) - cos(A)

hope that helps! ^-^

Answer 2

The error is made at step 1). The correct trigonometric identity is cos(π - A) = cosπcosA + sinπsinA.

What are trigonometric identities?

Trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined.

cos(π - A) = cosπcosA + sinπsinA

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Related Questions

nnnnnnnnnnnnnnvvvvvvvvvvvvmmmmmmmmmm k

Answers

nom nom nom nom nom nom CHOMP COMP :)

4xy- 72 = 3w solve for y

Answers

Answer:

y= [tex]\frac{3w}{4x}[/tex]+ [tex]\frac{18}{x}[/tex]

Step-by-step explanation:

Hope this helps. Plz give brainliest.

What is the radical expression that is equivalent 27 1/5?
Enter your answer as a radical. For example, if your answer is 14−−√3, enter your answer like this: cuberoot(14)

Answers

Answer:

possible answers are shown in picture.

Step-by-step explanation:

i will give u brainliest

Answers

Answer:

u = 3

Step-by-step explanation:

[tex] {u}^{3} = 27[/tex]

[tex] {3}^{3} = 27[/tex]

[tex]3 \times 3 \times 3 = 27[/tex]

Answer:

u = 3 , − 3 − 3 i √ 3 /2 , − 3 + 3 i √ 3 /2

Step-by-step explanation:

Factor using difference of cubes and set each factor equal to  0 .

I need to solve for c
3b +ac=c-4

Answers

Answer:

The answer is

c=-4+3b/a-1

answer both correctly and I’ll give golden brain c:

Answers

Answer:

1.a=5,b=-2

Step-by-step explanation:

2x+a=5-bx

divide by 2

[tex]x+\frac{a}{2}=\frac{5}{2}+\frac{-b}{2}x\\for~ to~ have ~infinite ~solutions\\\frac{a}{2}=\frac{5}{2}\\a=5\\1=\frac{-b}{2}\\b=-2[/tex]

or

equate the coefficients of like terms

-b=2

b=-2 (coefficient of x)

a=5 (constant terms)

2.

72°

external angle= sum of two opposite internal angles.

∠2=42+30=72°

Some people advise that in very cold weather , you should keep the gas tank in your car more than half full. Irene's car had 5.80 gallons in the 13- gallon tank on the coldest day of the year. Irene filled the tank with gas that cost 3.80 per gallon. How much did Irene spend on gas?

Answers

Answer:

22.04

Step-by-step explanation:

We are told in the question that:

Irene filled the tank with gas that cost 3.80 per gallon.

She has 5.80 gallons in her tank.

Hence:

1 gallon of gas = 3.80

5.80 gallons =

Cross Multiply

5.80gallons × 3.80/1 gallon

= 22.04

Therefore, Irene spent 22.04 on gas

Write an equation and solve for x

Answers

3x+12+x=90, simplify (4x+12=90), subtract both sides by 12 (4x=78), divide both sides by 4 (39/7)

First CORRECT ANSWER gets Brainliest

Answers

Answer:the actual answer is 43 not 34

Step-by-step explanation:

PLEASEE HURRY what is the value of x?

Answers

65 because 180-45=135. And 135-5=130. 130/2=65!

What is the quotient? The problem has been started for you.
89.5 but theres a line over 5
89.6
89.6 with a line over 6
89.7 ​

Answers

Answer:89.6 (with line)

Answer:c

Step-by-step explanation:

Plz help ASAP and good explanation thank you

Answers

10 + 43 - 5 = 48

5^2 = 25

48/6 = 7

7 + 25 = 32

Answer 32

-12 = 6+ 2/3 y


Pleaseeeee help me ❤️

Answers

The answer is Y=-27 hope it helps

The table shows values for the two functions f and g for different values of x.

What is f(g(0))?

-1

0

1

This composition is undefined.

Answers

Answer:

C.) 1

Step-by-step explanation:

EDG 2020

The value of f(g(0)) is 1.

What is Composition of Functions?

Composition of two functions f and g can be defined as the operation of composition such that we get a third function h where h(x) = (f o g) (x).

h(x) is called the composite function.

Given a table which shows values for the two functions f and g for different values of x.

We have to find the value of f(g(0)).

f(g(0)) = f[ g(0)]

From the table, g(0) = -1.

f(g(0)) = f(-1) = 1

Hence the value of f(g(0)) is 1.

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The table is given below.


pumbaa paid monthly mud bills of $85, $77 and $72. His mud budget is
$322 for three months. How much was pumbaa underbudget?

Answers

Answer:

88$ for 3 months

Step-by-step explanation:

85 plus 77 plus 72 = 234

322-234=88$

What is the equation in slope-intercept form of the line that passes through the points(−4,2) and (12,6)?

y = 4x + 18

y = 0.25x + 3

y = 4x − 42

y = 0.25x − 4.5

Answers

Answer:B

Step-by-step explanation:

Factorize the given expression and divide them as directed.


[tex](m^{2} -5m +6) divided (m-2)[/tex]

Answers

Answer :

We have to find :

m² - 5m + 6 / (m - 2) = ?

First of all, we need to factorize

(m² - 5m + 6)

⭆ m² - 5m + 6

⭆ m² - (3 + 2)m + 6

⭆ m² - 3m - 2m + 6

⭆ m(m - 3) - 2(m - 3)

⭆ (m - 2) (m - 3)

★ Division :

➠ m² - 5m + 6 / (m - 2)

➠ (m - 2) (m - 3) / (m - 2)

➠ (m - 3) [Final answer][tex].[/tex]

Hope It Helps!

WILL MARK BRAINLIEST!!!!!!!!!!!!!!!!!

Answers

Answer:

c

Step-by-step explanation:

Answer:

c && ty for the points :))))

Step-by-step explanation:

What is the value of x? 30 points to whoever answers QUICK!!

Answers

Answer:

i think the anwser is eight

Define the opposite and the absolute value of 6.
The opposite of 6 is -6. The absolute value of 6 is 6.
The opposite of 6 is 6. The absolute value of 6 is 6.
The opposite of 6 is -6. The absolute value of 6 is -6.
The opposite of 6 is 6. The absolute value of 6 is -6.

Answers

answer:

the opposite of 6 is -6 and the absolute value of 6 is 6

explanation:

cause its 6 <3

The opposite of the number is -6 and its absolute value is 6.

We have a number -  6.

We have to find out the opposite and the absolute value of the number.

What is the Opposite and Absolute value of a number.

For a number - 'n', its opposite is '- n' and the absolute value of a number - 'n' is -

[tex]$n=\left \{ {{n} \;\;\;for \;n > 0\atop {-n}\;\;\;for\;n < 0} \right.[/tex]

We have a number = 6.

The opposite of the number = - 6.

The absolute value of a number = 6.

Hence, the opposite of the number is -6 and its absolute value is 6.

According to the question -

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I need help finding x and y angle.

Answers

Y: 90 degree, right angle
X: 52 degree, acute angle
Hopefully this is what you were asking!

Jessica walks 1/3 miles to the post office and then 2/5 mile to the library. How far did Jessica walk altogether?

Answers

Answer:

11/15

Step-by-step explanation:

Please can someone answer this

Answers

Answer:

Greatest Number of Teams: 8

Number of Girls per Team: 5

Number of Boys per Team: 4

Step-by-step explanation:

32÷8=4

40÷8=5

Teams: 8

Girl members : 5

Boy members: 4

Explanation:
Makes the most sense

which graph represents the function y=(x+3)^2+1?

Answers

theheheheshbffhddhdep

HELP PLS IM GOING TO CRY

Answers

Answer: y = 4/4x +  3

which value is a solution for 4m = -132​

Answers

Answer:

The answer is m = - 33

Step-by-step explanation:

An airplane flies 2,175 miles in 3 hours. What is the average speed of the airplane?

Answers

Answer:

725 miles per hour

Step-by-step explanation:

ok distance=rate times time

2175=3x

/3

=725

How to solve this one step inequality

Answers

Answer: add 1 to both sides

             -1+r+1≥4+1

              simplify

               x≥5

Step-by-step explanation:

What is the approximate value of x? Round to the nearest tenth.

Answers

Answer:

40 degreses

Step-by-step explanation:

there is a right angle and that means it is 90 degreese then it gives you 50 degreese so you add them up and get 140 then you subtract that 140 from 180 and get 40 degreese.

Answer:

c

Step-by-step explanation:

cause it is

Triangle PQR has side lengths 6 cm, 7 cm, and 11 cm. A
triangle with what side lengths would be similar to
triangle PQR?

Select one:
1) 24 cm, 28 cm, 44 cm
2) 3 cm, 5 cm, 9 cm
3) 7 cm, 8 cm, 12cm
4) 24 cm, 21 cm, 33 cm

Answers

Answer: the correct answer is 3

The side lengths similar to triangle PQR are 24 cm, 28 cm, 44 cm

What are similar triangles?

Two triangles are similar if they have the same ratio of corresponding sides and equal pair of corresponding angles.

Given that, a triangle PQR with side lengths 6 cm, 7 cm, and 11 cm.

Considering option 1) 24 cm, 28 cm, 44 cm

To see the similarity, we will check if the ratio of the corresponding sides are equal or not,

6/24 = 1/4

7/28 = 1/4

11/44 = 1/4

That means, 6/24 = 7/28 = 11/44 = 1/4

Since, the corresponding sides of these triangles are in equal ratios,

Hence, The side lengths similar to triangle PQR are 24 cm, 28 cm, 44 cm

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