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2. ∫ x cos²x dx = -1/2 x sin²x
tanda turunan integral
+ x² cos 4x
- 2x 1/4 sin 4x
+ 2 -1/8 cos 4x
- 0 -1/32 sin 4x
rumus
tanda(baris1) x turunan(baris1) x integral (baris2) + seterusnya....
1/4 x² sin 4x+ 2/8x Cos 4x - 2/32 sin 4x + C
1/4 x² Sin 4x + 1/4 x Cos 4x - 1/16 Sin 4x + C