$\frac{1}{\cos a^2}$
$\left(4x^2-26x+25\right)\left(x-5\right)$
$7x^2-28x-35=0$
$3x^5\left(y^1\right)^2-xy^1-y=0$
$5^{11}\cdot5^{-8}$
$4x^3+2x^2-4x$
$\frac{7}{3x}=\frac{2}{x+5}$
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