Question

More proving identity help, medal and fan

-sinx= 2 cosx -2

Thanks!

Answer 1

Sorry, -sin^2x

Answer 2

so it's: \(\large -sin^2x=2cosx-2\) , this is the identity?

Answer 3

Yes.

Answer 4

notice that \(\large sin^2x=1-cos^2x \) so we can put that into the left hand side:

\(\large -(1-cos^2x)=2cosx-2 \)

ok so far???

Answer 5

Yep, that's what I had so far.

Answer 6

ok... now distribute the "-1" on the left hand side and move everything from the right over to the left so that the right side is zero...

Answer 7

what is the resulting equation?