If cosec a + cot a =x, find cosec a - cot a?
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now , cot² a + 1 = cosec² a
⇒cosec² a - cot²a = 1
⇒(cosec a - cot a) * (cosec a + cota) = 1
⇒(cosec a - cot a) * x = 1
⇒cosec a - cot a = 1/x
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=cosec^2a=1+cot^2a
=cosec^2a-cot^2a=1
=(coseca+cota)(coseca-cota)
=x(coseca-cota)=1
=coseca-cota=1/x
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