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

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Answer 1 · 2015-10-16T20:46:50

$2$

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

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

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

$=2$ (By standard triangle values)

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