DEF is right angle at E. if m F = 300 Then Find the value of $$ left – McqOptions

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1.	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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