$\sqrt{-14}$
$x^2+y^2=b^2$
$\frac{5ca^6}{3b^6c^{-1}}$
$\sec\left(x\right)^2\cot\left(x\right)+\cos\left(x\right)$
$\frac{\left(2x^4+3x^3-10x^2-3x+6\right)}{\left(x^2-2\right)}$
$4a^2-a$
$\left(21a+13b\right)^2$
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