" (c) "cosec21+cot2A=cot A

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cosec A- 2cot 2A cos A=

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Prove that : (sec A - tan A)/ (cosec A + cot A) = (cosec A - cot A)/ (sec A + tan A)

The value of (cosec 2A - cot 2A) is-

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(1)/(cosec A-cot A)+(1)/(cosec A+cot A)=?