$\frac{1}{1+\tan\left(x\right)}=1$
$-\frac{e^xsiny}{a}=0$
$\int\frac{1}{x^3-x^2+x-1}dx$
$x+1=\:6$
$\lim_{x\to0}\frac{\left(\sqrt{16-x^2}-4\right)}{x}$
$21-7v+v-14$
$\sqrt[9]{x^{49}}$
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