How do you prove the identity # Cos2x-sinx=0#?
1 Answer
Oct 20, 2015
cos2x =
SO,
1-
1-2
2
2
2
2sinx(sinx +1) -1(sinx +1)=0
(sinx+1) ( 2sinx -1) =0
either or
sinx=-1 sinx=1/2
So you can solve for these values of sinx.