00:01
Okay, so we're given that cosine of x, well, that's equal to 4 over 5.
00:05
Okay, so let's draw that out in a triangle.
00:09
So we have cosine, where that's adjacent.
00:13
So we have 4 over hypotenuse, so that's 5.
00:16
And now we're also given that co -secretion of x is less than 0.
00:19
Well, co -secreting that in terms of sign, we have 1 over sine of x is less than 0.
00:27
So that means that our sign term must be less than 0, which means that it must be negative.
00:32
So let's start by solving our remaining opposite side, which is our sine of x.
00:39
So we have hypotenuse 5 squared is equal to 4 squared plus y squared.
00:48
Okay, so 5 squared minus 4 squared that gives me 9 is equal to y squared...
