Rewrite the function using the power-reducing formulas.
f(x) = cos2 x

f(x) = cos 2x = 2 cos^2 x - 1

Step-by-step explanation:

Here, we want to rewrite the given function using the power reducing formula

f(x) = cos 2x

Recall;

cos 2x = cos(x + x)

= cos x • cos x - sin x• sin x

= cos^2 x - sin^2 x

But Sin^2 x = 1 - cos^2x

Thus;

Cos^2x - sin^2 x = cos^2 x - (1 - cos^2 x)

= cos^2 x + cos^2 x - 1 = 2 cos^2 x - 1

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation:

b.my answer is b.

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