0606 P21 - Jun 2021 - Q6 - 6 marks
7977
Variables \(x\) and \(y\) are such that
\(y=e^{\frac{x}{2}}+x\cos2x,\)
where \(x\) is in radians. Use differentiation to find the approximate change in \(y\) as \(x\) increases from \(1\) to \(1+h\), where \(h\) is small.
