How do you integrate cos squared (1 Viewer)

[rahulpaley]

ok my problem is this. I need to know how youintegrate cos^2(x/4)

That is cos squared times x/4

 

[Uncle]

ok my problem is this. I need to know how youintegrate cos^2(x/4)

That is cos squared times x/4

cos of what?

cos²(#)*(x/4) ?
cos²(x/4) ?

If there was something in '#' this problem requires integration by parts which is in Extension 2.

 

[rahulpaley]

yeah cos<SUP>2</SUP>x/4

 

[Trebla]

This uses an Ext1 method:
cos (x/2) = 2cos²(x/4) - 1

Make cos²(x/4) the subject and integrate...