The value of x , 0 le x le (pi)/2 which...

The value of x ` , 0 le x le (pi)/2` which satisfy the equation ` 81^( sin^(2)x)+81^(cos^(2)x)=30 ` are

A

`(pi)/(3)`

B

`(pi)/(4)`

C

`(pi)/(6)`

D

`(7pi)/(18)`

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The correct Answer is:

A, C

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