$\frac{\sin\left(a\right)+\tan\left(a\right)}{1+\cos\left(a\right)}=\tan\left(a\right)$
$2^{-2}\cdot2^6$
$3a+2b-c+4c+b$
$2x+5xy-3x^2y^2z^2;\:x=2;\:y=-3$
$\frac{4n^3+n^2+3n}{n+1}$
$\frac{274.23}{0.087}$
$\frac{630}{35}$
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