Question

упростите :(1-cos x)(1+cos x)/sinx​

Answer 1

1-Cos^2x / Sinx= Sin^2x / Sinx = Sinx

Answer 2

$\frac{(1-cosx)(1+cosx)}{sinx}=\frac{1-cos^2x}{sinx}=\frac{sin^2x}{sinx}=sinx$