$\lim_{x\to\:0}x^{2x^2}$
$2x+y;\:x=2;\:y=3$
$a^2-20ac+100c^2$
$7-2n+1$
$20x^2+50x-70$
$x^2-8x-20=0$
$\frac{2tanx}{1+tan^2x}=\:cos$
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