# Thread: Derivative using Wolfram Alpha

1. ## Derivative using Wolfram Alpha

Why is Wolfram Alpha calculating this wrong:

$\displaystyle f(u)=(arcsinu)^{-1}$ then what is $\displaystyle f'(\frac{1}{\sqrt2})=$

My calculator says $\displaystyle f'(\frac{1}{\sqrt2})=-2.99547$

Why does Wolfram Alpha say -2.29 instead?

2. Originally Posted by Kataangel
Why is Wolfram Alpha calculating this wrong:

$\displaystyle f(u)=(arcsinu)^{-1}$ then what is $\displaystyle f'(\frac{1}{\sqrt2})=$

My calculator says $\displaystyle f'(\frac{1}{\sqrt2})=-2.99547$

Why does Wolfram Alpha say -2.29 instead?
my calculator says -2.292636673

3. Originally Posted by Kataangel
Why is Wolfram Alpha calculating this wrong:

$\displaystyle f(u)=(arcsinu)^{-1}$ then what is $\displaystyle f'(\frac{1}{\sqrt2})=$

My calculator says $\displaystyle f'(\frac{1}{\sqrt2})=-2.99547$

Why does Wolfram Alpha say -2.29 instead?
Please explain exactly what you think you mean by $\displaystyle f(u)=(arcsinu)^{-1}$.

Also please give the exact command string you have given Wolfram Alpha.

CB