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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)`

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The correct Answer is:
A
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