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Step-by-step explanation:
1 + Tanθ / 1 - Tanθ
= 1 + 1/Cotθ/ 1 - 1/Cotθ
= Cotθ + 1 /Cotθ/ Cotθ - 1/Cotθ
= Cotθ + 1/Cotθ - 1
= R.H.S
Hence proved.
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