Question 18
TrigonometryIf sin θ = 3/5, where 0° < θ < 90°, evaluate cos(180 − θ).
- A.4/5
- B.3/5
- C.−3/5
- D.−4/5
Show the answer and explanation
Answer: D (−4/5)
Explanation
cos θ = 4/5, and cos(180° − θ) = −cos θ = −4/5.
If sin θ = 3/5, where 0° < θ < 90°, evaluate cos(180 − θ).
Answer: D (−4/5)
cos θ = 4/5, and cos(180° − θ) = −cos θ = −4/5.