# I need help with an integra

• February 26th 2010, 02:11 AM
hoger
I need help with an integra
hi!

How do I solve the integral of:

(x.arcsinx/squrt 1-x^2 )dx x bilongs (-1,1)

thanks
• February 26th 2010, 02:33 AM
Ted
Quote:

Originally Posted by hoger
hi!

How do I solve the integral of:

(x.arcsinx/squrt 1-x^2 )dx x bilongs (-1,1)

thanks

$\int_{-1}^1 \frac{x {\displaystyle } sin^{-1}(x)}{\sqrt{1-x^2}}dx$ is an improper integral.
Re-write it in terms of limits.
to evaluate the integral.
Use $t=sin^{-1}(x)$ then integration by parts.