cot (x)/ (csc(x)-1)= (csc(x)+1)/cot (x)
(cos/sin)/(1/sin -1) cos /(1-sin) multiply top and bot by (1+sin) cos(1+sin)(1-sin^2) or (1+sin)/cos right side (1/sin +1) /( cos/sin) (1+sin)/cos same
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