$\frac{x^5}{16x^4\:-1}$
$\frac{\cos\left(x\right)-\sin\left(x\right)^2}{\sin\left(x\right)}$
$4+x>9$
$16y^2-81y^2$
$\int\:4x^2\ln\left(x\right)dx$
$27p^{12}-q^{21}$
$10\cdot\left(2^3+7-6\right)$
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