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

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: 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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