16.
\(\displaystyle\int (x+3)\cdot(x-3)\,dx=?\)
17.
\(\displaystyle\int \samefrac{x^2+4x+6}x\,dx=?\)
18.
\(\displaystyle\int \samefrac{x^2+1}{\sqrt x}\,dx=?\)
19.
\(\displaystyle\int ((\sqrt x+\sqrt[3]{x^2})\cdot x^{-1})\,dx=?\)
20.
\(\displaystyle\int \left(\sqrt[3] x-\samefrac1{x^7}+\samefrac2{x^3}\right)\,dx=?\)
21.
\(\displaystyle\int \samefrac{(3x-6)^2-36}{x^2}\,dx=?\)
22.
\(\displaystyle\int \samefrac{(x^2y^2+x^3y^{-2})}{xy}\,dx=?\)
23.
\(\displaystyle\int (4x^3+5x^2-6)\,dy=?\)
24.
\(\displaystyle\int \samefrac{x^2-1}y\,dy=?\)
25.
\(\displaystyle\int x(x-1)^2\,dx=?\)