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int(sintheta)^(costheta)f(xtantheta)dx(w...

`int_(sintheta)^(costheta)f(xtantheta)dx(w h e r etheta!=(npi)/2,n in I))` is equal to (a) `-costhetaint_1^(tantheta)f(xsintheta)dx` (b)`-tanthetaint_(costheta)^(sintheta)f(x)dx` (c)`sinthetathetaint_1^(tantheta)f(xcostheta)dx` (d)`1/(tantheta)thetaint_(sintheta)^(sinthetatantheta)f(x)dx`

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