i thought the answer would be # 3 cuz...?

Question

u=1
u^2+2u
which is 3 but it turned out to be wrong can you help me out?


http://i181.photobucket.com/albums/x85/ctti_3/Untitled-60.jpg

Answer 1

Evaluate the integral:

∫[(tanx + 2)/cos²x] dx

= ∫[(tanx + 2)sec²x] dx

= ∫[(tanx)(sec²x) + 2sec²x] dx

= (1/2)sec²x + 2tanx + C

I can't read the upper limit. But drop the C and evaluate the expression at the limits.

p.s. Photobucket should only be used for graphs or something that can't be typed in. We shouldn't have to go to a link to see a question that could have been easily typed in. When we have to go to a link, we can't see the question when we are answering it.

Answer 2

u = tan x +2
du = sec^2 x dx= 1/(cos^2 x)
u^2/2 evaluate (?,0)
I cant read the upper limit