If tan y = 0.404, where y is acute, find cos 2y
MATHEMATICS
WAEC 2006
If tan y = 0.404, where y is acute, find cos 2y
- A. 0.035
- B. 0.719
- C. 0.808
- D. 0.927
Correct Answer: B. 0.719
Explanation
tan y = 0.404; y = tan-1 0.0404(tables);y = 22o
cos 2y = cos 2(22o); cos 44o
= 0.719
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