Integral ini caranya gmn

1.a = 2x^4

1.c = x (x^2 + 1)
= x^3 + x
= 1/4 x^4 + 1/2 x^2

1.d 3x^3 - 2x^2 + x

1.e x^2 + 4x

2.d 2x^9 - 5x^5 + x^3