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4*e^(10*x^9-(4*x^3))
(x^2)/4-(ln(x)/2)
2*x-x^2+4 < 1;x
x
2*ln(x)+(1*(2/(15^(1/2))))/tan((2*x+1)/(15^(1/2)))
abs(2*x-x^2+4) < 1;x
x
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