$\left(2f^2+f\right)^2$
$tan\left(x\right)+cot\left(x\right)=\frac{1}{y}$
$3a^2+8a-16$
$10-5\left(9n-9\right)$
$x+6=3x+22$
$16x^2+56-49$
$13=\left(x+7\right)^2+\left(x\right)^2$
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