(1+sin theta )2+(1-sin theta )2/2costheta
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Now, {(1 + sinθ)² + (1 - sinθ)²}/(2 cosθ)
= (1 + 2 sinθ + sin²θ + 1 - 2 sinθ + sin²θ)/(2 cosθ)
= (2 + 2 sin²θ)/(2 cosθ)
= (1 + sin²θ)/(cosθ)
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