Question 10

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waecmaths question: 

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

Option A: 

0.035

Option B: 

0.719

Option C: 

0.808

Option D: 

0.927

waecmaths solution: 

$\begin{align}  & y={{\tan }^{-1}}(0.404)=21.9987 \\ & \cos 2y=\cos 2(21.9987)=cos43.9974\simeq 0.719 \\\end{align}$

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