Question

(Sinx/1-cosx)+(1+cosx/sinx)=2(1+cosx)/(sinx)

Answer 1

the first term:
sinx / 1-cosx
time both numerator and denominator by 1+ cosx
sinx ( 1+ cos x)/ 1- cos^2 x
sinx (1+ cos x)/ sin^2x
(1+ cosx)/ sinx
+ the second term = the right hand side