$\lim_{x\to0}\frac{e^{x^2}-x^2-1}{\ln\left(1+x^2\right)-x^2}$
$-2m-4m$
$2x\left(8x-3x\right)$
$-4\left(x+2\right)-x$
$\left(5x^my^nz\right)\left(-2x^2y^3z\right)$
$a\left(x+l\right)+b\left(x+l\right)$
$\tan\left(30\right)^2-\cot\left(30\right)^2$
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