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If 0lexlepi and 81^(sin^(2x))+81^(cos^(2...

If `0lexlepi` and `81^(sin^(2x))+81^(cos^(2x))=30` then x=

A

`(pi)/(6)`

B

`(pi)/(2)`

C

`(pi)/(4)`

D

`(3 pi)/(4)`

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