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Question

sinA+sin3AcosA+cos3A=tanxA
Find x;

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Solution

sinA+sin3AcosA+cos3A=2sin(3A+A2)cos(3AA2)2cos(3A+A2)cos(3AA2)=sin2AcosAcos4AcosA=tan2A=R.H.S.
Ans: 2

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