$\sqrt{1+\tan^2}a$
$2x^2-5x-2$
$4-1^4-1+2$
$\frac{d}{dx}\sqrt{2x-3}$
$\sqrt{\sqrt{\sqrt{64x^4d^2}}}$
$\frac{-x^3+8}{2x^2}$
$\left(1+x-2x^2\right)^2$
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