$\frac{3-\sqrt{5+x}}{2-\sqrt{13-5}}$
$\frac{d}{dx}\:\frac{7tant}{3+3sect}$
$15x^2\:-29x\:-14\:\cdot5x\:+2$
$\int_0^{\sqrt{x}}2ye^{x^2}dy$
$\frac{8x^2+2x^3+3}{x^2+2x-1}$
$\lim_{x\to-4}\left(\frac{x^2-16}{\left(x+4\right)^2}\right)$
$\frac{1}{sin\:4x}$
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