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[" If "],[" f(x) "=sgn(3x cos^(-1)(x)-6c...

[" If "],[" f(x) "=sgn(3x cos^(-1)(x)-6cos^(-1)(x)-pi x+2 pi)],[" ,then the number of points "],[" of discontinuity of "f(x)" is/are "],[" [Note: sgn k denotes signum "],[" function of k.] "]

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