$\frac{\left(2x\right)}{\sqrt{49+x^2}}$
$\left(5-7\right)-\left|\left(-3\right)+\left(-6\right)\right|$
$3^4.5^2$
$\left(2xy^2-3\right)dx+\left(2x^2y+2\right)dy=0$
$\left(6+11c\right)^2$
$2+0-7+8-10-15+14-20+15$
$d\left(x\right)+e^{3x}d\left(y\right)$
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