Find the value of the trigonometric function $\cot \left(-\frac{15 \pi}{4}\right)$
Find the value of the trigonometric function $\cot \left(-\frac{15 \pi}{4}\right)$
It is known that the values of cot $x$ repeat after an interval of $n$ or $180^{\circ}$
$\therefore \cot \left(-\frac{15 \pi}{4}\right)=\cot \left(-\frac{15 \pi}{4}+4 \pi\right)=\cot \frac{\pi}{4}=1$
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