$\lim_{x\to2}\left(x^2+2x-7\right)$
$4-sin^2x\:$
$\lim_{x\to\pi}\left(\frac{1-\cos\left(2x\right)}{1-senx}\right)$
$\left(a+b\right)\left(2c-d\right)$
$\int4\csc^2xdx$
$4m^2-4m=1$
$\frac{x^7+x^5+1}{x^3+1}$
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