$\tan\left(20\right)=\frac{\sin\left(20\right)}{1+\cos\left(20\right)}$
$100=324$
$\left|-5-4\right|$
$2x^2+8x+1=0$
$\int_e^{3x}dx$
$\frac{2}{3}xy-xy$
$400x-12-8-10x+5x$
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