If tan y = 0.404, where y is acute, find cos 2y

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Mathematics WAEC 2006

If tan y = 0.404, where y is acute, find cos 2y

  • 0.035
  • 0.719 checkmark
  • 0.808
  • 0.927

The correct answer is: 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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