Prove that cot^4 A-1 = cosec^4A 2cosec^2 A
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Step-by-step explanation:
LHS=cot*A-1
=(cot²A)²-(1)²
=(cot A+1)(cot²-1)
=(cosec²A-1+1)(cosec²A-1-1)
=cosec²A(cosec²A-2)
=cosec¹A-2cosec*A=RHS
HENCE PROVED
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