$\lim_{x\to0}\frac{x}{x^2+6x}.\cos\left(x+5\right)$
$x^4y^2-x^2y^4$
$45\cdot99$
$a^2+b^2=30$
$x^2-\left(x+1\right)^2$
$16a^2\:+\:24ab\:+\:9b^2$
$\lim_{x\to0}\left(\frac{2x^2}{e^x}\right)$
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