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manipulasi,
= sin A(1 - cos A)/(1 + cos A)(1 - cos A) + (1 + cos A) / (sin A)
= (sinA - sinAcosA) / (1 - cos²A) + (1 + cosA) / (sinA)
= (sinA - sinAcosA) / sin²A + (1 + cosA) / (sinA)
= (sinA - sinAcosA) / sin²A + (sinA)(1 + cosA) / sin²A)
= (sinA - sinAcosA + sinA + sinAcosA) / sin²A
= 2sinA / sin²A
= 2 / sinA
= 2cosec A
= E.
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