$\lim_{h\to0}\left(\frac{\cos\left(a+h\right)-\cos a}{h}\right)$
$\left(2x^2\right)\left(5y^3\right)$
$x^3-2x^2-4x+8$
$\left(0.2h-1\right)^2$
$\left(c^3-7\right)^2$
$-997-2004$
$\int\frac{x^2+1}{\left(x^2-2x+2\right)}dx$
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