How do you find the exact value of $csc^-1 2$ ?

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Answer 1 · 2018-06-30T16:35:56

$csc^(-1)2=30^@$

$csc^(-1)2$ represent the angle $alpha$ whose cosecant ratio is $2$ i.e. $cscalpha=2$

or $sinalpha=1/cscalpha=1/2$

As $sin30^@=1/2$ , $alpha=30^@$

i.e. $csc^(-1)2=30^@$

How do you find the exact value of csc^-1 2csc^-1 2?