00:01
We're given the function y is equal to 3x minus 5 times cosine of 2x squared.
00:14
Now we're asked to find the derivative.
00:17
Okay, so y prime is equal to, well, the first part is easy because we're just looking for a derivative of 3x, so that's going to be 3.
00:26
And then the next part, our 5 is a constant where it's a coefficient, we can just leave it in the front.
00:32
And derivative of cosine of something.
00:36
So we'll call that our u.
00:38
Well, that's actually just negative sign of our u.
00:43
Okay, so that's five times negative sign of our u, which is 2x squared...