$21+9b-4b$
$16z^2+8z+1$
$\frac{dy}{dx}\left(\frac{x^2}{cos\left(x\right)}\right)$
$\sqrt{x^{\frac{4}{7}}}$
$40\left(\frac{7}{5}\right)a$
$\frac{x^3-4x^2+x}{x}$
$\frac { ( 3 x + 2 ) ^ { 2 } } { 4 }$
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