Q (10)  Find the values of the trigonometric functions

\small \cot \left ( -\frac{15\pi }{4} \right )

Answers (1)

We know that cot x repeats after an interval of \pi or 180\degree
\cot \left ( -\frac{15\pi}{4} \right ) = \cot \left ( -4\pi +\frac {\pi}{4} \right ) = \cot \left ( \frac{\pi}{4} \right ) = 1

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