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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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