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cos3x - cos2x = 2cosx 71/2, 371/2, Tt . Solve in degrees. sin x + cos x x: 1350, 3150 . Verify the identity = - cos 9 . Solve in degrees. 3sec2x - 2tan2x - 4 ... — sin x COS cosx + sin + I sink z sin* Find the exact value of cos 150 . Find the exact value of sin420cos120- cos420sin120 ) COS 1/2 . Verify the identity. sin (3TC-x) ................
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