$2\sec\left(x\right)\tan\left(x\right)$
$x^9-x^6-64x^3+64$
$6a^x+1+8a^x^{+^1}$
$\left(8b+xyz\right)^2$
$\left(x+6\right)\left(2x-2\right)$
$\frac{6.5-4}{9-4}$
$3-\sqrt{x^2}+5$
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