$\left(2x^2x-3y\right)^2$
$\left(-6\right)\cdot\left[-\left(-2\right)-3\cdot\left(-4\right)\right]$
$2\left(\frac{\sigma}{l}-x\frac{h}{s}\right)$
$x^2+25y^2=100$
$sin^2xcos^4x$
$16-36n^2$
$\frac{4a}{4a+8b}$
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