27. Hasil dari soal integral di bawah adalah ...

integral 1/x² dx
= x^-2 dx
= 1/(-2+1) x^(-2+1)
= 1/-1 x^-1
= -1 x^-1
= -1/x
= -1/2 - (-1/1)
= -1/2 + 1
= 1/2

27) int (1/x^2) dx
= Int (x^-2) dx
= 1/(-1) x^-1 | batas 1 sampai 2
= -1/x | batas 1 sampai 2
= -1/2 - (-1/1)
= -1/2 + 1
= 1/2

28) int (sin 3t + cos t) dt
= -1/3 cos 3t + sin t | batas 0 sampai π
= (-1/3 cos 3π + sin π) - (-1/3 cos 0 + sin 0)
= (-1/3 (-1) + 0) - (-1/3 (1) + 0)
= 1/3 + 1/3
= 2/3