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a. 2sin2 x + sinx.cosx – 3cos2 x = 0 b. 3sin2 x – 4 sinx.cosx + 5 cos2 x =2 c. sin2 x + sin2x - 2 cos2 x = 1/2 d. 2cos2x - 3√3sin2x - 4sin2x = -4
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