need help on calc question?

Question

6. Integral of (3x^2) -1/x dx
7. Integral of (x^2)-25/x+5 dx
8. Integral of cot x dx

Answer 1

its very simple to integrate those
look:
the integration of x² = x³ /3
the integartion of 1/x =In IxI ok
the int of 5 = 5x

6)int((3x^2) -1/x dx)

=3x³ / 3 - InIxI +c
=x³ -InIxI +c

7)int (x^2)-25/x+5 dx
= x³ /3 - 25 In IxI +5x +c

8) int(cot x dx )
= In IsinxI +c

Answer 2

6) = x^3-lnIxI+C
7) =1/3x^3 -25lnIxI+5x +C
8=lnIsin xI+C