2sinx –1 = 0

3cos 2x – sin 2x – 1 = 0 3(cos2x – sin2x) – 2sin x.cos x – (cos2x + sin2x) = 0. 3cos2x – 3sin2x – 2sin x.cos x – cos2x – sin2x = 0. 2cos2x – 2sin x.cos x – 4sin2x = 0 so 2(cos x – 2 sin x)(cos x + sin x) = 0. tan x = or tan x = – 1 etc. sin 2x + cos x + 3 cos 2x = 3 + 3 sin x 2sc + c + 3(1 – 2s2) = 3 + 3s. 2sc + c ... ................
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