$\lim_{x\to-1}\left(\frac{x+1}{\sqrt{x+5}}\right)$
$2y\:-\:4\:+\:9$
$\frac{1}{\sin\left(2x\right)}+\frac{1}{\tan\left(2x\right)}=\cot\left(x\right)$
$9x^4y^2-12x^3+9x^2y^6$
$\left(-3\right).\left(-4\right).\left(+3\right)$
$4x+5y=-15$
$\frac{2}{5}x-3\ge2x+8$
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