if tan = 20/ 21 dhow that (1 - sin + cos)/(1 + sin + cos) = 3/7
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tan θ =20/21, show that (1-sinθ+cosθ) /(1+sinθ+cosθ)= 3/7 If tan theta =20/21, show that (1-sin theta+cos theta) /(1+sin theta+cos theta)= 3/7
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