$\tan\left(x-\frac{\pi}{2}\right)=-\cot\left(x\right)$
$\frac{81x^4+625}{3x-5}$
$\lim_{x\to0}\left(\frac{cos\left(sen\left(x\right)\right)-\cos\left(x\right)}{x^4}\right)$
$\left(a+2\right)^3-6\left(5\right)^2-4\left(a+2\right)+20$
$8-24\::\:\left(-1-5\right)$
$\frac{1}{cos\left(cos\left(x\right)\right)}$
$7x^2-6x-35$
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