$f\left(x\right)=\sec\left(2x-4\right)$
$\lim_{x\to\infty}\left(x^2.e^{-2}\right)$
$\left(5x^m-2y^n\right)\left(5x^m+2y^n\right)$
$x^2-2x-63=0$
$\lim_{x\to+\infty}\left(\frac{4e^{3x}-3x^2}{e^x-x}\right)$
$2x-y=5$
$\frac{2x+2-x}{x^2+1}$
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