$\int\:9x^{-\frac{1}{2}}dx$
$x^3+2x^2-1$
$2tanx-2=0$
$6\left(3+4x\right)-5\ge157$
$\left(3y+6x\right)\left(3y-6x\right)$
$50\cdot1.300g$
$\left(9-b+c\right)^2$
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