Solving trigonometric equations
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2tan^2 x sinx = tan^2 x
0, 30, 150, 180
sin^2 x - sinx = 0
0, pi/2, pi
2cos(4x)=1
15, 75, 105, 165, 195, 255, 285, 345
2sin2x - 1 = 0
15, 75, 195, 225
3 tan^2 x - 1 = 0
30, 150, 210, 330
sin^2 x = cos^2 x
45, 135, 225, 315
tanx - cotx = 0
45, 135, 225, 315
cot x cos^2 x - cot x = 0
90, 270
2 sin^2 x - sin x - 1 = 0
pi/2, 7pi/6, 11pi/6
2 sec x + 1 = sec x + 3
pi/3, 5pi/3
sinx - 1 = -sinx
pi/6, 5pi/6
sin2x = cosx
pi/6, pi/2, 5pi/6, 3pi/2
2 cos x = (3)^(1/2)
30, 330