00:01
Okay, we're asked to show that u cross v is orthogonal to u .d.
00:06
V times u plus v plus u.
00:10
Okay, starting with our right -hand side, we have u .b times u plus v plus u.
00:27
Let's multiply or do the dot product with both of them because we know they're orthogonal, so we have u .d.
00:34
V times u plus v plus u, plus u, dot with u cross v.
00:42
Okay, that's equal to u .v times v.
00:58
Or v plus u.
01:03
Oh, whoops, give me a second.
01:05
This is actually, yeah, let me write this, so it's u...