- #1
ldbaseball16
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Homework Statement
solve by using intergration by parts x^2(cosx)dx
Homework Equations
My question is i got this answer but my computer algebra system gave me this answer
(x^2-2)sin(x)+2xcos(x) can you tell me where i went wrong??
The Attempt at a Solution
u=X^2
dv=cosx
du=dx
v=sinx
Sx^2(cosx)dx=uv-Svdu=x^2(sinx)-Ssinxdx
S2xcosxdx=2xsinx-(-cosx)+c= final answer= 2xsinx+cosx+C