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4sin^4x+cos^4x=1 if...

`4sin^4x+cos^4x=1` if

A

`x = npi + pi/6`

B

`x =npi +- theta` where `cos^(2)theta = 3/5` and `x =npi, n int I`

C

`x = (2n+1)pi/2`

D

`x = 2npi +-pi/3`

Text Solution

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The correct Answer is:
B
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