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[" 1.5.4Consider,"f(x)=tan^(-1)((2)/(x))...

[" 1.5.4Consider,"f(x)=tan^(-1)((2)/(x)),g(x)=sin^(-1)((2)/(sqrt(4+x^(2))))" and "h(x)=tan(cos^(-1)(sin x))" ,then show that "],[ln(f(x))+h(g(x))={[0,,quad x<0],[x,,x>0]]

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