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f(x) = det{{1, cos^4 x, sen^4 x}, {1 , (1+sin^2 x)^2 , sen^4 x} ,{1, cos^4 x, (1+cos^2 x)^2}}
f(x) = det{{1, cos^4 x, sen^4 x}, {1 , (1+sin^2 x)^2 , sen^4 x} ,{1, cos^4 x, (1+cos^2 x)^2}}
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