Question

If sin x/ (1+cos x) + sin x/ (1−cos x) = k, then k is equal to _____________.

Answer 1

sin x/(1+cos x)+sin x/(1-cos x)

sin x*(1-cos x)+sin x*(1+cos x)/(1+cos x)*(1-cos x)

sin x- sin x cos x+sin x+ sin x cos x/1-cos x^2

2 sin x/ sin x^2

2/sin x=k