$9k^2-25$
$\left(2m\:-\:4n\right)^2$
$xe^x-e^x+\frac{1}{2}y=c$
$6+8b+6c$
$\left(2w^2z^3t^4\right)^2$
$\left(x^{-3}.a^4\right)^5.\left(x^{-2}.a^6\right)^{-3}$
$cot\left(20\right)-\frac{sin\left(70\right)}{sin\left(20\right)}$
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