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

If cos `28^(@) + sin 28^(@) = k^(3),` then cos `17^(@)` is equal to

A

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

B

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

C

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

D

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

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The correct Answer is:
B, C
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SURA PUBLICATION-TRIGONOMETRY-EXERCISE 3.12
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