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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
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Correct Answer: Option B
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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