.

\fO 1. f(a ) = sin (2k - 1)x 2k - 1 k=1 O 4TT 2. f (ac ) = > sin (2k - 1)x 2k - 1 k=1 2 3. f (ac) = sin (2k - 1)x (2k - 1)T k=1 4. None of the above O 4 5. f (ac ) = E sin (2k - 1)x (2k - 1)1 k=