If 4sin^4x+cos^4x=1, then x is equal to ...

If `4sin^4x+cos^4x=1`, then x is equal to `(n in Z)`

A

(a) `npi`

B

(b) `npipmsin^(-1)((2)/(5))`

C

(c) `npi+(pi)/(6)`

D

(d) `npi-(pi)/(6)`

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The correct Answer is:

A

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