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= (sin x - sin x cos x + sin x + sin x cos x)/ (1- cos^2 x)
= (2 sin x)/ (1-cos^2 x)
jawaban d.
= sin^2 α + 2 sin α cos α + cos^2 α + sin^2 α - 2 sin α cos α + cos^2 α
= 2
jawaban e.
= (1- cos^2 ∅)/ sin ∅