Asked by Anonymous
Find all angles θ between 0° and 180° satisfying the given equation. Round your answer to one decimal place.
cos(θ) = − 4/5
cos(θ) = − 4/5
Answers
oobleck
cosθ is negative in QII and, QIII
cos 36.9° = 4/5
so use that as your reference angle, and you get
180-36.9°
cos 36.9° = 4/5
so use that as your reference angle, and you get
180-36.9°