$\left(8x^2+9\right).\left(8x^2+4\right)$
$12+x-5x^3+x^2-\left(x-1\right)$
$x^4+3x^3-10x^2$
$\lim_{x\to0}\left(\frac{x-sin15x}{tanx}\right)$
$\frac{k\left(2x+1\right)}{x\left(x+1\right)\left(0.2x+1\right)}$
$\sqrt{-50}$
$2x^3-5x^2+x+1\:y=2$
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