V
valdes


[TEX]\int_0^{\frac{\pi}{4}}\frac{1}{1-tan^8x}dx[/TEX]
[TEX]\sqrt[4]{14 - 4cos2x} - \sqrt[4]{3 - 4cos2x}=1[/TEX]
[TEX]\sqrt[4]{14 - 4cos2x} - \sqrt[4]{3 - 4cos2x}=1[/TEX]
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