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[" 30."alpha sin^(-1)x+sin^(-1)y=(pi)/(2...

[" 30."alpha sin^(-1)x+sin^(-1)y=(pi)/(2)" ad,di "],[[x sqrt(1-y^(2))+y sqrt(1-x^(2))=......],[[" (a) "0," (b) "1," (c) "-1," (d) "2]]]

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