$\frac{1-tan^2x}{1+tan^2x}=2cosx-1$
$m^4-n^2$
$\lim_{x\to0}\left(e^x-1\right)\left(\cot\left(x\right)\right)$
$ab3-2ab=478$
$f\left(x\right)=\frac{1}{1-x^3}$
$6\cdot\left(-3\right)+6\cdot\left(-4\right)$
$x^2-4x+4\le0$
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