$\left(81x^2-4y^2\right)$
$\left(x^2+y^3\right)^3$
$250-\left\{100+78-\left[38+15-\left(-45\right)\right]\right\}$
$3\:x\:\frac{3}{4}$
$-108-1$
$9x^2-24x+10$
$sin\left(\frac{n\pi x}{l}\right)sin\left(\frac{m\pi x}{l}\right)$
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