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Given the function f(x)={{:(,3^(-x)-1, -...

Given the function `f(x)={{:(,3^(-x)-1, -1 le x lt 0),(,tan (x//2), 0 le x lt pi),(,x//(x^(2)-2),pi le x le 6):}`
Find f(-1), `f(pi//2), f((2pi)/3), f(4), f(6)`.

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