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i2837856393

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## Homework Statement

[tex]\int[/tex]ydx + zdy

C

where C is the part of the helix r(t)=(sin t)

**(i)**+ (cos t)

**(j)**+ t

**(k)**

and 0 < t < pi (those should be greater than or equal to signs)

[tex]\int[/tex](cost)(cost)-t(sint)

[tex]\int[/tex](1+cos 2t)/2 - t sint

with limits from zero to pi.

this then equaled to

1/2t + (sin 2t)/4 + tcost -sin t

and this gave me the answer 3(pi)/2

but the answer should be 3 pi..

can anyone else solve this and check please or tell me where i went wrong.