$\left(1+sen\:a\right)\left(1-sen\:a\right)=\frac{1}{sec^{2\:}a}$
$\frac{d^{14}}{dx^{14}}\left(2\cdot\cos\left(x\right)\right)$
$\frac{1}{x^3\left(x+1\right)}$
$125x^9-64y^{15}$
$\int\left(\frac{x+2}{x^2}\right)dx$
$y-3>-9$
$\lim_{x\to0}\left(\frac{x-ln\left(1+x\right)}{x}\right)$
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