$y^2=\sec\left(2x\right)$
$12xyz+8x^2y^3z^4+10x^4y^2z^3$
$-x^2-3x+2$
$\lim_{x\to2}\left(\sqrt{4y^2-2y}\right)$
$x\left(x-3\right)=4$
$\cos\left(2a+b\right)+\cos\left(2a-b\right)$
$-\left(-\left(-7-3\right)-\left(7-3\cdot0\right)\right)$
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