$\frac{2x+21}{2x^2+9-5}$
$\int-3\cdot\sec^2\left(-3x\right)dx$
$\int2y+xe^{xy}dy$
$2-\left(-3\right)^2$
$x^2-3x-9$
$0.234+1.23$
$x^2+x+3x^2-3x$
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