91Ó°ÊÓ

Find the values of the following trigonometric ratios: (a) \(\cos 210^{\circ}\) (b) \(\cos 480^{\circ}\) (c) \(\sin (-\pi / 2)\) (d) \(\cos -\pi\)

\(\cot 570^{\circ}\)

If \(\tan \theta=3 / 4\) lies in 3 rd quadrant, find all trigonometric ratios.

If \(\cot x=\frac{-5}{12}, x\) lies in second quadrant, find the values of other five trigonometric func-