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[" 6.If "0<=x<=pi" and "81^(sin^(2)x)+81...

[" 6.If "0<=x<=pi" and "81^(sin^(2)x)+81^(cos^(2)x)=30," then "x=],[[" (a) "pi/6," (b) "pi/2," (c) "pi/4," (d) "3 pi/4]]

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