$1-2x-x^2=0$
$4x+y+9y+14x+8y+72$
$3x+3=18$
$\frac{6s^8-10s^6+12s^4}{-2s^3}$
$\left(81n^4-16v^3\right)\left(81n^5+16v^3\right)$
$\int_4^{\infty}\frac{1}{2}\:x^2\:dx$
$\frac{5}{8}cos\:y=\frac{5\sqrt{2}}{16}$
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