12. for which of the following pairs of functions f and g is 8 an extension ot j (a) s) =* (0 s* < ) 8)= *i(00*< ). (6) ja) =1(-1 s* s ), g() = 1(0 s*< o) (c) s

12. For which of the following pairs of functions f and g is 8 an extension ot j (a) S) =* (0 S* < ) 8)= *I(00*< ). (6) Ja) =1(-1 s* S ), g() = 1(0 S*< o) (c) S) = sin : (0 s* s27), g)= V1 - cos * (co<< o).