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if 0<=x<=pi and 81^(sin^2x)+81^(cos^2x)...

if `0<=x<=pi` and `81^(sin^2x)+81^(cos^2x)=30` then `x=`

A

`pi//3` or `pi//6`

B

`2pi//3` or `5pi//6`

C

`pi//6` or `5pi//6`

D

none of these

Text Solution

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The correct Answer is:
A, B, C, D
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