Question

how to find value of cosec 210 o

Answer 1

cosec 210= cosec(270-60)
= - sec 60
= -2

Answer 2

$cosec 210 \\\\ = cosec(270-60) \\\\ =-sec60 \\\\ = -[\frac{1}{cos60} ] \\\\= \frac{-1}{\frac{1}{2}} \\\\ = -2$