Answer:
Explanation:
Step 1: We know that the cosine of an angle in Quadrant III is negative.
Step 2: We convert the given angle A into radians by multiplying it by pi/180.
A = (7/√120) * (π/180) = (7π)/(12√5)
Step 3: We use the cosine formula to find the exact value of cos A.
cos A = cos((7π)/(12√5))
Step 4: We simplify the result using trigonometric identities.
cos A = (-1/3)√5