Question 1015183
<pre>
A (sine) wave starts at the origin (0,0), 
goes up to its maximum,
back down to the x-axis,
down below the x-axis to its minimum,
and back up to the x-axis.

The maximum is the amplitude value.
The minimum is the negative of the amplitude value.
The wave ends on the x-axis at the period value.

Here is your wave:

{{{drawing(400,608, -.5,4.5,-3.8,3.8,

graph(400,608, -.5,4.5,-3.8,3.8,

3sin((pi/2)x)*(sqrt(x)/sqrt(x))*(sqrt(4-x)/sqrt(4-x))




) )}}}

Edwin</pre>