( 1+tan A.tanB)square +(tanA-tanB)square = sec squareA.sec squareB
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(1+tanA.tanB)square+(tanA-tanB)square=1+tansquareA.tansquareB +tansquareA+tansquareB=secsquareA.secsquareB
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see attachment.....I hope my work will help u...
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