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2. u'v + uv' = 2x.cos2x + x^2.-2sin2x = 2x.cos2x - 2x^2sin2x
dicek lagi ya^^
f ' (x) = 15 sin² (5x + 8) cos (5x + 8)
2. f(x) = x² cos 2x
f ' (x) = 2x cos 2x - 2x² sin 2x