Trig
posted by Lynn .
Verify the following identity:
1cosx/sinx=sinx/1+cosx

You must mean
(1cosx)/sinx = sinx/(1+cosx)
LS = (1cosx)/sinx * (1+cosx)/(1+cosx)
= 1  cos^2 x)/(sinx(1+cosx) )
= sin^2 x/(sinx(1+cosx) )
= sinx/(1+cosx)
= RS