$2x^2\:para\:x=2,y=1$
$\tan\left(-x\right)=\tan x$
$0.66+4+43.34$
$\lim_{x\to0}\left(\frac{1+\cos\left(x\pi\right)}{x^2-1}\right)$
$3x^2-6+2x\ge0$
$4a^4+3a^2b^2$
$4\left(5j+4\right)+7j$
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