00:01
Okay, so let's find that t value.
00:02
Okay, so from the first equation, t cosine of pi t is equal to 5, and then negative t plus sine of pi t is equal to negative 4.
00:17
Add them up, these go away.
00:20
So sine of pi t plus cosine of pi t is equal to 1.
00:29
Okay, so sine of pi t, no matter what t is, you know, 0, pi, 2 pi, 3 pi, 5 pi, it's always 0.
00:43
So this is the one that we need to focus on, and we need to make this positive.
00:47
So cosine of pi t and cosine of 2 pi is 0.
00:55
So t has to be either 0 or, so let's say it's 0...