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Let f(x)=2tan^(3)x-6tan^(2)x+1+sgn(e^(x)...

Let `f(x)=2tan^(3)x-6tan^(2)x+1+sgn(e^(x)),AA x in [-(pi)/(4),(pi)/(4)],` Then the positive difference between the least value and the local maximum value of the function is (where sgn (f(x)) represents the signum function)

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