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[" If "3" cot "A=4" check whether "],[qq...

[" If "3" cot "A=4" check whether "],[qquad ((1-tan^(2)A))/((t+tan^(2)A))=cos^(2)A-sin^(2)A" or not."],[" 17.Prove the identity "],[" using the identity "cosec^(2)A=1+cot^(2)A]

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