$4f+14-f-6$
$\sqrt{1-\left(\sqrt{x}\right)^2}$
$2-31+17-21+89-39-7+3$
$\left(3x+\frac{5}{2}\right)^2$
$-42x+84$
$2\left(x+5\right)+6\left(x-3\right)$
$\lim_{x\to0}\left(\frac{\pi}{2}-x\right)\sec\left(x\right)$
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