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misal u = sin(4x)
du = 4 cos(4x) dx
du/4 = cos(4x) dx
so,
= 1/4 int u^3 du
= 1/4 * 1/4 u^4 + C
= 1/16 u^4 + C
= 1/16 sin^4 (4x) + C