Question

tan^2 (x)=(1-cosx)/(1+cosx) true or false

Answer 1

true?

Answer 2

Multiply top and bottom by 1-cosx.

Answer 3

\[\frac{ 1-cosx }{ 1+cosx } * \frac{1-cosx}{1-cosx} = \frac{1-2cosx + \cos^{2}x}{1-\cos^{2}x}\]

Answer 4

now solve the rest with substitution and factor.

Answer 5

thanks

Answer 6

i got some weird thing when i factor it

Answer 7

what?

Answer 8

you should get cosx-1 and cosx -1

Answer 9

never mind i figured it out