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WAEC - Mathematics (2006 - No. 10)
If tan y = 0.404, where y is acute, find cos 2y
0.035
0.719
0.808
0.927
Explanation
tan y = 0.404; y = tan
-1
0.0404(tables);y = 22
o
cos 2y = cos 2(22
o
); cos 44
o
= 0.719
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