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Step-by-step explanation:
(1-tanA upon 1- cotA) sq = (1- sinA upon cosA /1- cosA upon sinA) sq = (cosA - sinA. upon sinA - cosA ) sq=
now open square=( cosA- sinA ) sin sq A upon (sin A - cos A) sq cos sq A = sin sq A upon cos sq A = tan sq A
hence proved.
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Refer to the image attached.
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