( (1 + cos^2 x ) / sin x - sin x ) 1/2 tg x

Question

( (1 + cos^2 x ) / sin x - sin x ) 1/2 tg x

Answer 1

((1+cos^2x)/sinx-sinx)tgx/2=0,5*(1+cos^2x-sin^2x)*sinx/cosxsinx=2cos^2x*sinx/2sinxcosx=cosx