$2 ( 3 ( 3 ) ) ^ { 2 }$
$\left[-21+\left(17-15\right)-54\right]-\left\{-11\right\}$
$\frac{1}{\cos\left(x\right)}-\frac{1}{1+\sin\left(x\right)}=\tan\left(x\right)$
$\int ya^ydx$
$z^3+8$
$\frac{1}{9}\:x^2\:-\:12$
$9x^2-3x-5-5x-9$
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