6. Find all points of discontinuity of f, where f is defined by

Given function is

GIven function is defined for every real number k
Different cases are their
case (i)  k < -3

Hence, given function is continuous for every value of k < -3

case(ii)    k = -3

Hence, given function is continous for x = -3

case(iii)   -3 < k < 3

Hence, for every value of k in -3 < k < 3 given function is continous

case(iv)  k = 3

Hence. x = 3 is the point of discontinuity

case(v)  k > 3

Hence, given function is continuous for each and every value of k > 3

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