$\cos^2\frac{x}{3}-\sin^2\frac{x}{3}$
$2w-6-3w$
$\frac{2}{1-x^8}$
$( 5 x ^ { \frac { 1 } { 8 } } ) ^ { 2 }$
$\frac{5}{\sqrt[3]{x}}+1$
$\frac{3+2x\sqrt{5^{2}+12^{2}}}{\frac{16}{5}-\frac{2}{5}\times3}$
$\int\frac{x^{3}+2x}{x^{4}+4x^{2}+3}dx$
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