$a^2-x^2-a-x^2$
$6+4+28x^2$
$\frac{1}{d^2+1}\left(2\cos\left(3x\right)-e^x+1\right)$
$25x^2-120x+143$
$sin\left(sin^{-1}u-cos^{-1}v\right)$
$\frac{2x+8}{2}=x+4$
$\sqrt{108a^6}$
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