If cos 28^(@)+sin 28^(@)=k^(3), then cos...

If `cos 28^(@)+sin 28^(@)=k^(3)`, then `cos17^(@)` equal to

A

`k^(3)/sqrt(2)`

B

`-k^(3)/sqrt(2)`

C

`sqrt(2)k^(3)`

D

`-sqrt(2)k^(3)`

Verified by Experts

The correct Answer is:

A

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