$-\frac{1}{7\left(\infty\right)}$
$12\cdot13\cdot4$
$\:\left(-15\right)^2\::\:\left(5\right)^2$
$\lim_{x\to\infty}\left(\sqrt[x]{7^x+5^y}\right)$
$\left(x+y\right)^2+4\left(x+y\right)+4$
$\left(-2x\:+\:4\right)\:+\:2\left(2x\:+\:1\right)$
$4z^2+24zw+36w^2$
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