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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)/(6)`

B

`(pi)/(2)`

C

`(pi)/(4)`

D

`(3pi)/(4)`

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