$\sin\left(z\right)\tan\left(z\right)+\cos\left(x\right)=\sec\left(z\right)$
$3x-12x+9$
$\frac{\left(4x+7\right)}{5x+8}=\frac{\left(11\right)}{14}$
$\frac{a^5c^4d^9}{b^4c^9}$
$\left(\frac{dx}{dy}\right)=x^2\left(1-3y\right)$
$\lim_{x\to-\infty}\left(\frac{4^x+13^x}{2}\right)$
$\left(c-1\right)\left(c-1\right)$
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