$\frac{\sin\left(x\right).\tan\left(x\right)}{\sec\left(x\right)\left(\cos^2\left(x-1\right)\right)}$
$3-\left(5-8\right)-\left(11-4\right)+\left(13-9\right)$
$\frac{sin\left(3\theta\:\right)+sin\theta\:}{cos\theta\:-cos\left(3\theta\:\right)}$
$\left(13y+4\right)^2$
$2\sqrt{6.5}$
$\frac{x^3}{4}-\frac{2}{x^4}$
$\lim_{x\to0}\left(\frac{cos\left(x\right)-1+\left(\frac{x^2}{2}\right)}{5x^4}\right)$
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