If tan y = 0.404, where y is acute, find cos 2y
A
0.035
B
0.719
C
0.808
D
0.927
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
tan y = 0.404; y = tan-1 0.0404(tables);y = 22o
cos 2y = cos 2(22o); cos 44o
= 0.719
Source: Myschool Past Questions Archive (Record #36165)