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[" 71.If "cos^(-1)(x)/(2)+cos^(-1)(y)/(3...

[" 71.If "cos^(-1)(x)/(2)+cos^(-1)(y)/(3)=theta" ,then the maximum of "9x^(2)-12xy],[cos theta+4y^(2)" is "],[[" (a) "18," (b) "30," (c) "24," (d) "36]]

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