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QUESTION
What is the integral of ##(cos^2x) / sinx##?
##int cos^2/sin x d x=l n(tan(x/2))+cos x+C##
##int cos^2/sin x d x= ?##
##cos^2 x=1-sin^2x##
##int(1-sin^2 x)/(sin x) d x=int (1/sin x-sin x)d x ##
##int cos^2/sin x d x=int (d x)/sin x- int sin x d x##
##int cos^2/sin x d x=l n(tan(x/2))+cos x+C##
