The terminal side of θ passes through the point (−5,−6).
What is the exact value of cosθ in simplified form?
−6√61/61
−5√61/61
6√61/61
5√61/61
The adjacent length is 5 and the hypotenuse is √(52+62) → √61
The point is in the third quadrant so the cosine is negative: -5/√61 → -5√61/61