$\lim_{x\to0}\left(\frac{e^{x^2}-e^{a^2}}{x-a}\right)$
$-x^2y-3x^2y$
$6ab^2c^3+6a^2b^2c^2+18a^3bc^2$
$\left(x-10\right)=2x-1$
$-4^2+6x+9$
$2x^2+15x+7=0$
$\left(-2\right)^3+\left(10\right)\cdot\left(2\right)$
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