For the functions below that have a removable discontinuity at [math] [if the function does not have a removable discontinuity, type in "n" below], state the value of [math], where [math] agrees with [math] for [math] and is continuous everywhere.

(a) [math], [math]

(b) [math], [math]

(c) [math], [math]

(d) [math], [math]

(a)
(b)
(c)
(d)