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Which of the following is not the value ...

Which of the following is not the value of `sin 27^(@) - cos 27^(@) ` ?

A

`- (sqrt ( 3 - sqrt5))/( 2)`

B

`- (sqrt ( 5 - sqrt5))/(2)`

C

`- (sqrt5 - 1)/(2 sqrt2)`

D

none of these

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The correct Answer is:
A
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