sin t /1-cos t - 1+ cos t/sin t= 0

Answer 1

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

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

sin t (1+cos t)/(1-cos^2 t) - (1+cos t)/sin t

sin t (1+cos t)/sin^2 t - sin t (1+cos t)/sin^2 t

0