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sin 5x - sin 2x diturunkan menjadi 5 cos 5x - 2 cos 2x
sin 8x - sin 3x diturunkan menjadi 8 cos 8x - 3 cos 3x
kemudian dimasukkan nilai x = 0 didapat
(5 - 2) / (8 - 3) = 3/5