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DeltaDEF is right angled at E. If mangl...

`DeltaDEF` is right angled at E. If `mangleF=30^(@)` ,then find the value of `(cosD-(1)/(sqrt(2)))`.

A

`-(1)/(2)`

B

`((sqrt(6)-1))/(sqrt(3))`

C

`((sqrt(2)-2))/(2sqrt(2))`

D

`sqrt(3)-2`

Text Solution

Verified by Experts

The correct Answer is:
C
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