If tan y 0 404 where y is acute find cos 2y - WAEC Mathematics 2006 Question
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 option: b
tan y = 0.404; y = tan-1 0.0404(tables);y = 22o
cos 2y = cos 2(22o); cos 44o
= 0.719
cos 2y = cos 2(22o); cos 44o
= 0.719
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