$\left(x+3\right)\left(x-3\right)+\left(4+x\right)\left(4-x\right)$
$a^2b-13ac+2ab^2\left(a=1;b=3;c=-2\right)$
$\int\frac{\cos\sqrt{x}}{\sqrt{x}\sin^{2}\sqrt{x}}dx$
$\left(6c+2d\right)\cdot\left(4d+m\right)$
$\left(8x+5y=47\right)\left(2x-6y=-10\right)$
$\left(9m^4-6n^2\right)$
$2\pi\cdot\frac{8}{16}$
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