Question

Just need someone to check my answer please
Simplify (1 − cos x)(1 + cos x).
1
cos^2 x <------
sin^2 x
tan^2 x

Answer 1

that is incorrect

Answer 2

\(1-\cos^{2}x\)

Answer 3

when you used the difference of squares formula, what did you get?

(1 − cos x)(1 + cos x) = ( )^2 - ( )^2

what goes in each parenthesis?

Answer 4

then use the pythagorean identity \(\cos^{2}x + \sin^{2}x = 1\)

Answer 5

it is 1 isn't it? because it is cos x^2 -cosx^2

Answer 6

\(cos x^2 -cosx^2 = 0\)

Answer 7

nope... and you may want to use the equation editor to write more clearly.

Answer 8

so what is the answer and how do i get to it?