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sinA/(1+cosA) + cosA/sinA = 1/sinA
sinA/(1+cosA) = 1/sinA - cosA/sinA
sinA/(1+cosA) = (1 - cosA)/sinA
sinA.sinA = (1+cosA)(1-cosA)
sin²A = 1 - cos²A
sin²A+cos²A=1 (selalu benar untuk setiap nilai A)
jadi semua besar sudut A merupakan penyelesaian.