Question

2sinXcosX = cosX

solve for x, how can i do it

Answer 1

i can only find 2 solutions: pi/6 and 5pi/6, but the solution says there are 4 solutions, how can i find the other 2?

Answer 2

2sinxcosx=cosx
2sinxcosx - cosx =0
cosx (2sinx - 1) = 0
take cos x=0 solve for x ... or
2sinx - 1 = 0 --> sinx = 1/2 solve x

Answer 3

Do u know cosx=0, for x=....?
and sinx=1/2, for x = ...?

Answer 4

@tanjung oh i see.. thanks u are a beast!

Answer 5

cosx=0, for x=pi/2 and 3pi/2
cosx=1/2, for x=pi/3 and 5pi/3 there are 4 solution