21. (a) If tan θ . v2-1, prove that sin θ cos θ:212(b) If ptan θ-q – InterviewSolution

1.	21. (a) If tan θ . v2-1, prove that sin θ cos θ:212(b) If ptan θ-q, firnd the value of p sin θ + qcos θpcos θ + qsin θ(c) If5cos A Ξ 1 2sin A, prove that tan 2 A-sin' A-sin' A sech
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