Question

How do you find the value of `csc (-210)`?

Answer 1

`2`

Explanation:

`csc(-210^@)=1/(sin(-210^@))=-1/sin(210^@)` (By trig ratios and identities)

`=-1/(sin(180^@+30^@)`

`=-1/(-sin30^@)` (By the `180^@` rule)

`=2` (By standard triangle values)