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Question

Prove the following trigonometric identities:

cot Acos Acot A+cos A=cosec A1cosec A+1

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Solution

LHS=cot Acos Acot A+cos A

=cosAsinAcosAcosAsinA+cosA

=cosecAcosAcosAcosecAcosA+cosA

=cosA(cosecA1)cosA(cosecA+1)

=cosecA1cosecA+1

=RHS


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