0606 P22 - Jun 2023 - Q7 - 12 marks
7700
(a) \(f(x)=\sqrt{3+(4x-2)^5}\), where \(x\gt 1\). Find an expression for \(f'(x)\), giving your answer as a simplified algebraic fraction.
(b) Variables \(x\) and \(y\) are related by the equation
\(y=\frac{5x}{3x+2}.\)
Using differentiation, find the approximate change in \(x\) when \(y\) increases from \(10\) by the small amount \(0.01\).
(c)(i) Differentiate \(y=x^3\ln x\) with respect to \(x\).
(c)(ii) Hence find
\(\int\frac{x^2}{6}(2+3\ln x)\,dx.\)
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