if cos theta - sin theta =1 , cos theta +sin theta =?

cosθ-sinθ=1squaring, we get cos2θ+sin2θ-2cosθsinθ=11-2cosθsinθ=1cosθsinθ=0.....1So cosθ+sinθ=cosθ-sinθ2+4cosθsinθ=12+4×0=1

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