Monday, 31 July 2017

calculus - How does frac1cosy = frac1sqrt1x2

I was going through a textbook of mine and I noticed that in the proof of derivative of

y=sin1,



i.e. proof that dydxsin1(x)=11x2



there's a point where they say 1cosy=11x2



and I'm not sure how this makes sense or works out. I've looked for proofs, tried implicit differentiation, and tried graphing it, but couldn't find anything. Can someone please explain?

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