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If f(x) is continuous in (-oo, 6), where...

If `f(x)` is continuous in `(-oo, 6)`, where `f(x)={: {(1+sin ((pi x)/(2))", for " - oo lt x le 1),(ax+b", for " 1 lt x lt 3),(6 tan ((pi x)/(12))", for " 3 le x lt 6):}`, then

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