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turunkan (3x+1) sampai menjadi konstanta ---> 3
integralkan cos(2x) ----> 1/2 sin(2x) -------------> - 1/4 cos(2x)
shg,
int (3x+1)cos(2x) dx
= (3x+1)/2 sin(2x) (-) - 3/4 cos(2x)
= 3/2 xsin(2x) + 1/2 sin(2x) + 3/4 cos(2x)