Let. $5f(x)+4f\left(\frac{1}{x}\right)=\frac{1}{x}+3,x0$ Then $18{\int }_{1}^{2}f(x)dx$ is equal to: [JEE Main 2023, 6 Apr (Shift 1)]

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Let. $5f(x)+4f\left(\frac{1}{x}\right)=\frac{1}{x}+3,x>0$ Then $18{\int }_{1}^{2}f(x)dx$ is equal to: [JEE Main 2023, 6 Apr (Shift 1)]

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Let. \(5f(x)+4f\left(\frac{1}{x}\right)=\frac{1}{x}+3,x>0\) Then \(18{\int }_{1}^{2}f(x)dx\) is equal to: [JEE Main 2023…