$x^5+x$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)-\cos\left(x\right)}{x^3}\right)$
$8x^4y^3-6x^2y^4$
$-28^0$
$9.6-7.7$
$x^4+x^5+yx$
$\tan\left(\frac{u}{2}\right)+\cot\left(\frac{u}{2}\right)=2\csc\left(u\right)$
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