$-tan\left(x\right)+\sqrt[2]{tan\left(x\right)^2-\frac{y}{\cos\left(2\right)^2}}\frac{\cos\left(x\right)^2}{2y}$
$\left(y^2-2\right)\left(y^2-7\right)$
$\lim_{x\to3}\left(\sqrt[3]{x-3}\right)$
$11x^2y\left(11xy^2\right)$
$\lim_{x\to\infty}\left(\frac{cos\left(12x\right)}{12x}\right)$
$\frac{sec\left(x\right)}{1+sec\left(x\right)}=\frac{1-cos\left(x\right)}{sin^2\left(x\right)}$
$\frac{\sec\left(a\right)}{\tan\left(a\right)}$
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