$\left(5x+9y\right)\left(5x-9y\right)+81y^2$
$81a^2b^4+54a^6b^3+9a^4b^2$
$6\sin^{2}\left(\theta\right)+\sin\left(\theta\right)-2=0$
$\int\:25t^4e^{-t^5}dt$
$1+6+12+8$
$\sqrt{2x-5}=7$
$8^2x^2+y^2$
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