[LaTeX] \int sin^2 2x cos2x dx=...

misalkan
u = sin2x
du = 2 cos2x  dx
du/2 = cos2x  dx

mka bentuk 
∫ sin²2x . cos2x  dx
mnjadi
(1/2) ∫ u²  du
= (1/2)(u³/3) + C
= (1/6)u³ + C
= (1/6) sin³2x + C