$x\frac{1}{2}+y\frac{1}{2}=9$
$\frac{x^3-2x-11x+12}{3}$
$-\frac{6}{11}-\:\frac{5}{11}$
$2k^3+8k^2-k-4$
$f\left(x\right)=\frac{x+3}{x^2+9x+18}$
$\frac{d^3}{dx^3}\left(cos\left(t\right)sen\left(t\right)\right)$
$\left(-4a^4-5a^2+a\right)+\left(5a^5-3a^4-a\right)$
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