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( cot a+ cosecb)( cosec b - cot a)
cosec^2 b - Cot^2 a = 1
As we know
cosec^2 - cot ^2 = 1 for same angle
therefore b = a
b - a= 0
So (3) is correct option
cosec^2 b - Cot^2 a = 1
As we know
cosec^2 - cot ^2 = 1 for same angle
therefore b = a
b - a= 0
So (3) is correct option
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