00:01
Here we're told that the cosine of an angle is 15 over 17 and the tangent is less than 0.
00:07
We want to find all the other five trig functions.
00:10
So what i'm going to do is draw a triangle that satisfies this scenario.
00:15
So if i make my theta right over here, the cosine is 15 over 17.
00:20
That's the adjacent over hypotenuse.
00:22
So i'm going to make 15 and 17 like that.
00:25
So then the last side we can use the pythagorean theorem.
00:27
Let's say we have x as that last side squared plus 15 squared needs to equal that 17 squared.
00:35
So i'm going to grab my calculator and do 17 squared.
00:38
And then i'm going to subtract 15 squared to get 64.
00:42
So x squared is 64, meaning x is 8...