i know that i need to use integration by parts but i am stuck on picking my u and dv
EDIT: the problem is the integral of 2xcos(x^2)dx sorry
i know that i need to use integration by parts but i am stuck on picking my u and dv
EDIT: the problem is the integral of 2xcos(x^2)dx sorry
At first glance, I thought this was a Fresnel integral. Which is more difficult. But it is actually much easier than that.
Just use substitution instead of parts.
$\displaystyle 2\int{xcos(x^{2})}dx$
Let $\displaystyle u=x^{2}, \;\ du=2xdx$
$\displaystyle \int{cos(u)}du=sin(u)$
$\displaystyle =sin(x^{2})$