Question

$\huge \underline{ \underline{ \bf \purple{Prove \: that :}}}$
$\large \sf { \sin}^{ - 1}( x )+ { \sin}^{ - 1}(2x) = \frac{\pi}{2}$
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Answer 1

${\bold{\sf{We\: can't\:prove\:sin^{-1}(x)+sin^{-1}(2x)=90°}}}$

Answer 2

90°

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