# Line integral question (1 Viewer)

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#### denian

is the first stepc orrect?
TQ.

Last edited by a moderator:

#### eok20

yep, everything looks good.

#### Galileo

Homework Helper
Yes, that's correct.

But (I guess) you've used a trig identity: $z'(t)=2\sin t \cos t=\sin(2t)$ in the last term. This will not make your integral easier. Best leave it as $2\sin t \cos t$.

#### denian

thank you very much, eok and galileo!

i get 7/6

#### TD

Homework Helper
The correct answer is 7/3 but it shouldn't matter whether you use that trig identity or not.

#### denian

tq. i'll try to check back this question later.

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