1.

The solution of (81)^(sin^(2)x) +(81)^(cos^(2)x)=30 in [0, pi//2] is

Answer»

`pi//4 or pi//2`
`pi//6 or pi//3`
`pi//4 or 3pi//4`
`2pi//3 or 3pi//4`

ANSWER :B


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