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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
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Correct Option: B

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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