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[4.0<=x<=pi,81^(sin^(2)x)+81^(cos^(2)x)=...

[4.0<=x<=pi,81^(sin^(2)x)+81^(cos^(2)x)=30," then "x=],[1)(pi)/(6)quad 2)(pi)/(4)quad 3)(pi)/(15)quad 4)(pi)/(8)]

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