Question

integrate xcos(x^2 + 1) using u substitution

Answer 1

hint:

u = x^2 + 1

du/dx = 2x

du = 2x*dx

du/2 = x*dx

Answer 2

-sin(u)/2 , then sub, is that right?

Answer 3

the integral of cos is not -sin

Answer 4

oops, backwards, it's sin, right?

Answer 5

yep

Answer 6

sin(u)/2 and then yes, you replace u with x^2+1

don't forget about the +C

Answer 7

always do, darn C

Answer 8

yes since it's an indefinite integral

Answer 9

ty jim