*Problem:*
Graphically investigate the function

with **a = 0** and for various values of **x** between **0** and **2p**.

*Visualization:*
The following is an animation of such an investigation using the program
Microcalc.

[Press here to see animation again!]
The animation shows the area bounded by the thin yellow line which is the
graph of **y = sin(t)**, the **t**-axis, and the line **t=x**
for various increasing values of **x**. The thick yellow line is the
graph of **y = F(x)**, the area function.