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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

derivate \(\displaystyle \sin^{-1}(x)\)

So I use the derivate formula for invers and get

\(\displaystyle \frac{1}{\cos(\sin^{-1}(x))}\)

and Then draw it and get \(\displaystyle \frac{1}{\sqrt{1-x^2}}\)

but there is a reason WHY it cant be \(\displaystyle -\frac{1}{\sqrt{1-x^2}}\) and I did not understand it, I did not get it.

Regards,

\(\displaystyle |\pi\rangle\)