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3 years ago

4 3⁄4 feet = How many inches

Mathematics

2 answers:

Y_Kistochka [10]3 years ago

5 0

4.75 feet is equal to 57 inches

Travka [436]3 years ago

3 0

Answer:the answer is 57 inches

Step-by-step explanation:

the reason it is 57 is because 4.75x12=57

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Rewrite with only sin x and cos x.

Annette [7]

Option A

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Solution:

Given that we have to rewrite with only sin x and cos x

Given is cos 3x

$cos 3x = cos(x + 2x)$

We know that,

$\cos (a+b)=\cos a \cos b-\sin a \sin b$

Therefore,

$\cos (x+2 x)=\cos x \cos 2 x-\sin x \sin 2 x$ ---- eqn 1

We know that,

$\sin 2 x=2 \sin x \cos x$

$\cos 2 x=\cos ^{2} x-\sin ^{2} x$

Substituting these values in eqn 1

$\cos (x+2 x)=\cos x\left(\cos ^{2} x-\sin ^{2} x\right)-\sin x(2 \sin x \cos x)$ -------- eqn 2

We know that,

$\cos ^{2} x-\sin ^{2} x=1-2 \sin ^{2} x$

Applying this in above eqn 2, we get

$\cos (x+2 x)=\cos x\left(1-2 \sin ^{2} x\right)-\sin x(2 \sin x \cos x)$

$\begin{aligned}&\cos (x+2 x)=\cos x-2 \sin ^{2} x \cos x-2 \sin ^{2} x \cos x\\\\&\cos (x+2 x)=\cos x-4 \sin ^{2} x \cos x\end{aligned}$

$\cos (x+2 x)=\cos x-4 \cos x \sin ^{2} x$

Therefore,

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Option A is correct

7 0

3 years ago

Help me please I don’t understand this and it is due tonight

andreyandreev [35.5K]

Answer:

y = 5/3x + 31/3

Step-by-step explanation:

5 0

3 years ago

What is the slope of a line parallel to the line with equation 5x 3y=7?

adell [148]

-5/3
down 5, over 3
:)

6 0

3 years ago

PLEASE HELP MATH 20 POINTS BRAINLIEST

Mamont248 [21]

Answer:

A, C, I, B, D, F, H, G

Step-by-step explanation:

im not sure if this is right if not im so sorry

4 0

3 years ago

Simplify each expression 1.) (7+x) + 7x Pls show your work

Papessa [141]

The answer is 14x.

You always have to do whats in the parenthesis first. In this case you would do 7 + x = 7x. Then, you add this 7x to the other 7 x. 7x+7x=14x.

8 0

3 years ago