The solution set of equation cos^(5) x =...

The solution set of equation `cos^(5) x = 1 + sin^(4) x ` is

A

`{n pi , n in I}`

B

`{2 n pi, n in I}`

C

`{2 n pi, n in I}`

D

`{n pi//2, n in I}`

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The correct Answer is:

A

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