Question

Find the value of the trigonometric function cot $(-\frac{15π}{4})$

Answer 1

It is known that the values of sin x repeat after an interval of 2π or 360°.

$∴cot(-\frac{15{\pi}}{4})=cot(\frac{15{\pi}}{4}+4{\pi})=cot\frac{\pi}{3}=1$