https://www.wyzant.com/resources/lessons/math/calculus/derivative_proofs/inverse_trig(adsbygoogle = window.adsbygoogle || []).push({});

The above link is just a proof for the derivative of arcsinx. Going from line 3 to 4, how does d/dx siny become dy/dx cosy ?

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# B Don't follow one small step in proof

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