Question

Please can anyone help me solve cos2x=sinx?

Answer 1

Use the double angle expression for the cosine to get
cos 2x = sin x cos2(x) - sin2(x) = sin(x)
Then replace cos2(x) by 1 - sin2(x) to get
(1 - sin2(x)) - sin2(x) = sin(x)

Answer 2

lol. right i understand that but its not proofing. its getting exact answers .The answers are
pie/6
5pie/6
and
3pie/2

Answer 3

oh

Answer 4

yeah so pretty much your trying to solve cos2x-sinx=0