$16^2+30^2$
$9-2\left(5-3\right)$
$\frac{\csc\left(x\right)\cot\left(x\right)}{\sec\left(x\right)\tan\left(x\right)}$
$-32x^2+48xy-18y^2$
$x^3-2xy-y=7$
$\left\{-3a+2-4b[2c-3b-\left(3c-1+2a\right)+3]+4b\right\}$
$\frac{a^2}{4}-ab+1$
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