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Solution of 7 sin^(2) x + 3cos^(2) x = 4...

Solution of `7 sin^(2) x + 3cos^(2) x = 4` is

A

`n pi pm pi//2`

B

`n pi pm pi//4`

C

`n pi pm pi//3`

D

`n pi pm pi//6`

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The correct Answer is:
D
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