<h3>SOLUTION :</h3>
<u>Given that</u> :

<u>To find</u> :

We know that cos θ is base/hypotentuse
So, here the base is -13 and the hypotentuse is 15
As we got the base and hypotentuse, perpendicular needs to be found out
Now, applying <u>Pythagoras </u><u>Theorem</u>
According to Pythagoras theorem we know that :
- (Hypotentuse)² = (Base)² + (Perpendicular)²
Let us assume perpendicular be x
Putting the values we get
By transposing we get
<u>sin θ formula : Perpendicular/Hypotentuse</u>

<u>Hence, the answer is </u><u>-</u><u>2√14/15</u>