$\frac{1}{\tan^2a+1}+\frac{1}{\cot^2a+1}$
$\sqrt{\frac{\sqrt[3]{x}\sqrt[3]{y^2}}{\sqrt[5]{x^2}}}$
$\left(\frac{2}{5}ab-\frac{3}{4}b^2\right)^2$
$\frac{x}{3x^{2+1}}$
$4x^2+32x+64$
$3x^3-12x^2-8x$
$\frac{5x-15}{x}$
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