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[" * The ralue of "x,0<=x<=pi/2" which s...

[" * The ralue of "x,0<=x<=pi/2" which satisfy the "],[" equation "81^(sin^(2)x)+81^(cos^(2)x)=30" are "],[[" (a) "pi/3," (b) "pi/4],[" (c) "pi/6," (d) "7 pi/18]]

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