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[" 21.The number of real solutions of "t...

[" 21.The number of real solutions of "tan^(-1)sqrt(x(x+1))+sin^(-1)sqrt((x^(2)+x+1))=(pi)/(2)" is "],[" 22."quad sec^(2)(tan^(-1)2)+cos ec^(2)(cot^(-1)3)=]

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