SinA by 1 ➕ cosA ➕ sinA by 1 ➖ cosA
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Step-by-step explanation:
sinA/1+cosA + sinA/1-cosA
=sinA[1/1+cosA+1/1-cosA]
=sinA[1-cosA+1+cosA/1-cos²A]
=sinA[2/sin²A]
=2/sinA
=2cosecA
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