$7+3r<4$
$9x^3-25x^7$
$\left(-44\right)-\left(-45\right)$
$h^4+18h^2\:k+81k^2$
$\int\sec\left(9\right)\left(x\right)^4dx$
$\left(m-7\right).\left(m-5\right)$
$\int t\cdot sin\left(t\right)\left(e^{-t}\right)dt$
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