prove that cot teta - cos teta / cot teta +cos teta = cosec teta -1 / cosec +1
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Do like this
(cot a - cos a) /( cot a + cos a) can be written as
((cosa/ sina) -cosa) / ((cosa/sina)+ cosa)
cosa (1/sina -1)/cos a(1/sina +1)
((1/sina) -1)/((1/sina+1)
= (cosec a -1)/(cosec a +1)
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