$\sec^2\left(1.570\right)$
$\sqrt{121w^4}$
$\left(a+b\right)^2-\left(a^2+b^2\right)$
$\int\left(\frac{x^2}{\left(81+x^2\right)^2}\right)dx$
$\lim_{x\to0}\left(\frac{a^x-b^x}{2}\right)^{\frac{1}{x}}$
$\frac{x^3+5x+2}{x+2}$
$f\left(x\right)=7x-8,5x^2+3x^3$
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