are we solving?
2sinxcosxsinx - cosx = 0
cosx(2sin^2 x - 1) = 0
cosx = 0 or sin^2x = 1/2
x = π/2 or x=3π/2 (90° or 270°)
if sin^2x = 1/2
sinx = ±1/2
x = π/4 , 3π/4, 5π/4, or 7π/4 (45°, 135°, 225° or 315°)
for the 2nd
use cos 2x = 2cos^2x - 1 to end up with a quadratic.
give it a try.
it will factor
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