ctgy/tgy +1= 1/Sin^2y
(cosy/siny) * (cosy/siny) + 1 = 1/sin^2y
ctg^2 +1= 1/sin^2y
1/sin^2y=1/sin^2y
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ctgy/tgy +1= 1/Sin^2y
(cosy/siny) * (cosy/siny) + 1 = 1/sin^2y
ctg^2 +1= 1/sin^2y
1/sin^2y=1/sin^2y