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  4. sin x = (2pq/p2 + q2) ⇒ cos ecx + cot x =

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Q. $\sin x = \frac{2pq}{p^2 + q^2} \, \Rightarrow \cos ecx + \cot x =$

Trigonometric Functions

Solution:

Use $( \sin^2 \, \theta + \cos^2 \, \theta) = 1$