HW 3
\begin{cases}
y = 2 \sin(x), & \text{if } x < 20 \\
y = \cos(3x), & \text{if } 20 \le x < 40 \\
y = \sin(0.3x), & \text{if } 40 \le x < 60 \\
y = 8 \cdot \sin(x), & \text{if } 60 \le x \\
y = 6, & \text{if } 6 < y
\end{cases}
Requirements:
(1) The plot should have x label, y label, and title. All of these should be Times New Roman, 12 pt.
(2) x range from 1 to 100 with 0.1 increment.
Plot x-y.
