$3m^7-2f^5+a+-4f^5-a-3a-9m^7$
$\lim_{x\to\frac{x}{2}}\left(5cos\left(-7x\right)sec\left(9x\right)\right)$
$27x^3-\:y^6$
$\frac{d^2}{dx^2}\left(sen\left(x^3+y^5\right)\right)$
$\int\sin\left(19x\right)\cos\left(13x\right)dx$
$\lim_{x\to0}\left(\frac{2-\cos\left(x\right).\left(e^x-e^{-x}\right)}{x^2}\right)$
$\frac{x+4}{x-2}\ge\:-4$
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