$\frac{cos\:a.\:sec\:a}{tan\:a}=cot\:a$
$\lim_{x\to2}\left(\frac{sen\left(\sqrt{x}-\sqrt{2}\right)}{\left(x-2\right)\left(x^3+1\right)}\right)$
$\left(2x\right)\left(6x\right)$
$x^2+15\cdot56$
$2x-1-x+5$
$2\cdot\frac{1}{2}\cdot\frac{1}{2}x$
$\int_{\pi}^{3\pi}\left(\sin\left(3x\right)\right)dx$
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