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cos2x + 3cosx . sinx - 2sin2x 2+3 1 + tan x .cosx tanx cos2x + 3cosx . sinx - 2sin x cos20 + 3cosO . Sino - 2sin20 cos2T + 3(cosT) x - 2sin2T (-1)2 ga-i-2 — cos2x + 3cosx . sinx - 2sin2x E(x) = cos2x + 3cosx x tanx. cosx - 2(1 - cos2x) = cos2x + 3cos2x x tanx - 2 + 2cos2x 2 ................
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