$\frac{3x+1}{3x^2+3x}$
$\lim_{x\to-1}\:x^2+5x-6$
$+8+\left(-7\right)-\left(+5\right)-\left(-3\right)+\left(-6\right)-\left(-1\right)$
$\int_0^{\frac{\pi}{6}}\left(10\sec^3\left(x\right)\right)dx$
$12x^2-3x+4-7x^2+9x$
$64x^2-40xy+16y^2$
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