[ If f(x)=|[x^(2)+sin x cos x,x(1+sin x)...

[ If f(x)=|[x^(2)+sin x cos x,x(1+sin x)x+cos x,x+1]|, then at least one root of f(x)=0 lies in [ (1) (0,(pi)/(6)), (2) (0,(pi)/(4)) (3) ((pi)/(4),(pi)/(3)), (4) ((pi)/(6),(pi)/(4))]]

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