$Q4.$ Obtain $y(1\mathrm{.}5)by$ solving the following ordinary

differential equation using Heun's method. Step size $=0\mathrm{.}50$

and initial conditions: $y(1)=2$

$\frac{dy}{dx}-3x+\frac{2y}{x}=0$

$Q5.$ Determine the following integral $by$ applying the Simpson's $\frac{1}{3}$ rule twice.

${\displaystyle \underset{0}{\overset{\frac{}{4}}{}}}\frac{x}{cos(x)}dx$