Answer:
-7/25
Step-by-step explanation:
is in quadrant two given that is between 90 degrees and 180 degrees.
This means cosine value there is negative and sine value is positive.
Let's use the Pythagorean Identity: .
Subtract 576/625 on both sides:
Take the square root of both sides:
So recall that the cosine value here is negative due to the quadrant we are in.
Check:
So we got the desired result since the right hand side of our Pythagorean Identity is 1.