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Plot[sqrt(x^4 + 3x^2 + 9)cos(x + arctan((3 - x^2)/(3x))), {x, 0, 60}]
Plot[sqrt(x^4 + 3x^2 + 9)cos(x + arctan((3 - x^2)/(3x))), {x, 0, 60}]
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