Question 10
TrigonometryIf tan y = 0.404, where y is acute, find cos 2y.
- A.0.035
- B.0.719
- C.0.808
- D.0.927
Show the answer and explanation
Answer: B (0.719)
Explanation
y = tan−1(0.404) ≈ 22°, so 2y ≈ 44° and cos 44° ≈ 0.719.
If tan y = 0.404, where y is acute, find cos 2y.
Answer: B (0.719)
y = tan−1(0.404) ≈ 22°, so 2y ≈ 44° and cos 44° ≈ 0.719.