$18v^3-15v^4+30v^5$

$24v^3-15v^4+25v^5$

$24v^3+15v^4-30v^5$

$24v^3-15v^4+30v^5$

1

2x

2x-3

2x+2

$9x^2-2x\$

6x - 1

6x

$9x^2-2\$

$-2x\left(x^2+1\right)^2$

$-\frac{2x}{x^2+1}$

$\frac{2x}{\left(x^2+1\right)^2}$

$-\frac{2x}{\left(x^2+1\right)^2}$

$\frac{1}{2\sqrt{x}}$

$-\frac{1}{2x\sqrt{x}}$

$-\frac{1}{4x\sqrt{x}}$

$\frac{1}{4x\sqrt{x}}$

4

$12x^2-4$

$12x^2$

$12x^2+4$

$\frac{-504x^5+120x^3}{6}$

$-4x^5+2x^3$

$-20x^4+6x^2$

$-80x^3+12x$