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Question Number 12368 by sin (x) last updated on 20/Apr/17

Answered by mrW1 last updated on 22/Apr/17

$$EF\times \cot 55+EF\times \cot 35+4=10$$$$EF\times \tan 35+EF\times \tan 55=6$$$$EF=\frac{6}{\tan 35+\tan 55}=2.819\approx 3$$$$\Rightarrow Answer\mathit{A}$$

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