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If cos^4x+4sin^4x=1, then general value ...

If `cos^4x+4sin^4x=1`, then general value of x equals to

A

`npi, n in I`

B

`npi+-sin^-1sqrt(2/5), n in I`

C

`(2npi)/3, n in I`

D

`2npi+-pi/4, n in I`

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A, B
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