I need help on the intergral of cos (pi/20) :S

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I need help on the intergral of cos (pi/20) :S

Mathematics
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in your integration there is no variable please write the question properly.
the full question is, pi/10 x cos (pi/20)
i think \[\int\limits_{}^{}\cos \pi x/20dx\] let \[y=\pi x/20\] after this substitution you will get dx=20 dy/pi\[20/\pi \int\limits_{}^{}\cos y dy=-20\sin y/\pi =-(20/\pi)\sin (pix/20)\]

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Other answers:

sin(pi/20)
see if there is no x under cosine function then it is simply a constant and you can take it outside the integration
Thankyou so Much :D
have you got your answer?
Just doing it now (:
ok.
if you have any doubt please ask.
Maths is hard.
are you talking in general or you haven't understand any step of mine?
General. Your steps helped alot.

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