$2x+y;\:x=7;\:a$
$\lim_{x\to0}\left(\frac{\cot\left(3x\right)}{\cot\left(4x\right)}\right)$
$\lim_{x\to1}\left(\frac{16}{x^2+2x-3}-\frac{4}{x-1}\right)$
$\lim_{x\to\infty}\:x^9\cdot e^{-x}$
$0.72+0.625+0.575+0.615+0.495$
$2\:=\:e^{-3}+c$
$\frac{1}{2}\left(16x-10\right)$
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