sin (alpha)*cos (alpha)*(tg (alpha)+ctg (alpha)

Question

Vanguard · Accepted Answer

Sin (a)*cos (a)*(sin/cos+cos/sin)=(1/2sin2 (a)*sin (a)*cos (a) / (1-sin^2 (a)=(1/2sin2 (a)*(1-sin (a) / (1-sin (a)=1/2sin2 (a)

sin (alpha)cos (alpha)(tg (alpha)+ctg (alpha)