$2x^2+4x-2.5$
$-40\cdot x^2+280\cdot x=0$
$13,682+1$
$\lim_{x\to1}\left(\frac{x+1}{\sqrt{x-5\:}-2}\right)$
$\frac{7x^2+42x}{3x^2-6x}\cdot\:\frac{15x-30}{14x^2+84x}$
$\int\:e^{2x}\:cos\cdot3x\:dx$
$-\cot\left(x\right)\sin\left(x\right)=-\cos\left(x\right)$
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