$6x^2\:+\:4x\:-3y\:+31=0$
$\lim_{x\to0}\cot\left(2x\right).\sin\left(6x\right)$
$-27-54$
$2n^4+2n^3+2n^2$
$\sqrt{5-4^2+4\left(4\right)}$
$5a^2-4a+3;\:a=-1;\:y=2$
$\frac{-8}{\infty^3}$
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