Q: ∆ DEF is right angle at E. if m∠F = 300 Then Find the value of – McqOptions

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1.	Q: ∆ DEF is right angle at E. if m∠F = 300 Then Find the value of $$\left( cos D - {1\over 2}\right)$$ = ?
A.	$$-{1\over2}$$
B.	$${{6}- \sqrt{1}}\over 3 $$
C.	$${\sqrt{2}- 2}\over 2\sqrt{2} $$
D.	$${\sqrt{2}- 2} $$
Answer» D. $${\sqrt{2}- 2} $$

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