Question

what is the formula for
${ \sin(a) }^{ - 1} + { \sin(b) }^{ - 1}$
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Answer 1

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${sin}^{ - 1} a + {sin}^{ - 1} b \\ = {sin}^{ - 1} (a \sqrt{1 - {b}^{2} } + b \sqrt{1 - {a}^{2} } )$