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1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x 2)sin 2x -sin5x + sin6x = 0 1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x 2)sin 2x -sin5x + sin6x = 0
Use exopansion property of cos(A+B) and applyyou will get the answer.Take sin5x on other side and then use the clubbing property of sinA+sinB.
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