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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`

Text Solution

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The correct Answer is:
A
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