Question

Как это решать?
sin(a)/(1+cos(a))

Answer 1

Решение:
(sin a) / (1-cos a) - (1+cos a)/(sin a)=0
((sin^2 a) -(1-cos a)*(1+cos a)) /((1-cos a)*(sin a)) =0
((sin^2 a)-1+(cos^2 a)) /((1-cos a)*(sin a)) =0
(1-1) /((1-cos a)*(sin a)) =0
0 /((1-cos a)*(sin a)) =0