$\lim_{x\to\infty}\left(\frac{e^x+e^x}{e^{-x}-e^{-x}}\right)$
$16a^4s^3-8r^2s^5$
$y+4+x+8$
$45x>7x-2$
$\int\left(7x+2\right)cos\left(4x\right)dx$
$\left(\sqrt{b}\right)\left(\sqrt{b}\right)$
$3^2-3^0+3^3:3$
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