$5x^4+3x-15x^2$
$\frac{9x^3+5x+7}{3x^2+4}$
$\int\frac{x}{x+\sqrt[2]{x}}dx$
$\left(b-9\right)\left(b-40\right)$
$\frac{dy}{dx}=\frac{\cos^2\left(x\right)}{\sin^2x}$
$\frac{dy}{dx}=\frac{xy+8y-x-8}{xy-9y+x-9}$
$\frac{15x^5}{3} x^2$
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