Question

Упростите выражение
sinx/1-cosx-sinx/1+cosx

Answer 1

$frac{Sinx(1+Cosx)-Sinx(1-Cosx)}{1-Cos^{2}x}= frac{Sinx+Sinx*Cosx-Sinx+Sinx*Cosx}{Sin^{2}x}=$$frac{2Sinx*Cosx}{Sin^{2}x}= frac{Sin2x}{Sin^{2}x}$