$9sec^2\left(9x\right)$
$5ab+6xy=6xy+5ab$
$\int_0^{45}2000e^{-.08}dt$
$\left(3ab^2-m^3\right)^2$
$5x+\frac{7}{2}y$
$7 x - 10 x ^ { 2 } + 15 x ^ { 2 }$
$-21+-1+0$
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