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If cos 17^(@) + sin 17^(@) = alpha, then...

If `cos 17^(@) + sin 17^(@) = alpha`, then `cos 34^(@)` is equal to

A

`alphasqrt(2-alpha^(2))`

B

`sqrt(1-alpha^(2))`

C

`alphasqrt(1-alpha^(2))`

D

`sqrt(2-alpha^(2))`

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The correct Answer is:
A
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