1
00:00:04,500 --> 00:00:06,500
Now substitute pi for theta

2
00:00:11,000 --> 00:00:14,000
Cosine of pi is negative one. Sine of pi is zero.

3
00:00:14,500 --> 00:00:16,500
e to the i pi equals negative one

4
00:00:19,000 --> 00:00:23,000
e to the i pi plus one equals zero. Five numbers. One equation.