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| 1. |
Prove that: (a) cot theta cot (60^(@)-theta)cot(60^(@)+theta)=cot 3 theta (b) cos 5 theta=16cos^(5)theta=-20cos^(3)theta+5 cos theta (c) sin4 theta=4 sin theta cos^(3)theta-4cos theta sin^(3)theta |
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