# Derivative using Wolfram Alpha

• Dec 6th 2009, 05:02 PM
Kataangel
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?
• Jan 4th 2010, 07:06 AM
skeeter
Quote:

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
• Jan 4th 2010, 09:28 AM
CaptainBlack
Quote:

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.

Attachment 14646

CB