$\int\frac{x^2+6x}{\left(x+2\right)^2+9}dx$
$4x^2+5bx$
$4x-3\ge2x-7$
$\int\sqrt{x-1}-\left(-1+x\right)dx$
$54-4^2$
$\cos ydx+\sec^2xdy$
$6x^{12}-9$
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