(i) The function
\(f(x) = \begin{cases}
5 & x ≤ 2\\\
ax + b,2< & x < 10\\
21 & x≥ 10
\end{cases}
\)is
continuous. Find a and b
(ii) Find \(\frac{dy}{dx}\) (a) if y = sin (xsinx)
(iii) If y = ae" +be' ;show that \(\frac{d^2y}{dx^2}\) - (m + n) \(\frac{dy}{dx}\) + mny = 0
