$\int\frac{x}{\sqrt{25x^4+9}}dx$
$\lim_{x\to5}\:\frac{x^2+3x}{x^2-5}$
$\lim_{x\to\infty}\left(x^3e^{-e^2}\right)$
$\sec^2\left(5x\right)=\frac{1}{3}$
$10\left(cos30+isen30\right)$
$\left(5x^4-2x\right)^2$
$\lim_{x\to-4}\left|x+4\right|$
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