$\int\frac{6x^3+9x}{x^4+3x^2}dx$
$2+4b\ge-7$
$ydx=2xdy$
$\frac{x}{x+y}\ge0.8$
$\int_0^x\left(t^2\right)dt$
$\int\left(\frac{5+\sqrt{x}}{\sqrt{x}}\right)^4dx$
$\left(x^3-3x\right)\left(x^3+2x\right)$
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