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Gunakan integral subsitutsi dengan:
u = sin x
Sehingga, akan didapat:
du = cos x dx
Yang mana:
Int (sin³x) (cos x dx)
Menjadi
= Int u³ du
Selesaikan:
= 1/4 u⁴ + C
Substitusi ulang u, akan didapat hasil:
= 1/4 sin⁴x + C