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sec^2 + 2 sec tan + tan^2 = ------------------
1/cos^2 + 2sin/cos^2 + sin^2/cos^2
1+ 2sin + sin^2 / cos ^2 udah kelihatan kan ?
(1+sin)^2 / (1-sin^2)
(1+sin) (1+sin) / (1+sin ) (1- sin) 1+sin di coret atas bawah
sisanya ???