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[" 20.If "f(x)={[(cos^(2)x-sin^(2)x-1)/(...

[" 20.If "f(x)={[(cos^(2)x-sin^(2)x-1)/(sqrt(x^(2)+1)-1),x!=0],[a,,x=0]" is "],[" continuous at "x=0," find the value of "a]

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