$x\left(x-1\right)=72$
$8-x^3$
$tan2x=2tanx1+tan2x$
$\left(4a^2-7\right)\left(4a^2+9\right)$
$\sin\left(x\right)^2-2\cos\left(x\right)^2=3\sin\left(x\right)^2-2$
$x+9=2x+1$
$\sqrt[2]{2}+\sqrt[2]{2}-5\sqrt[2]{2}$
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