f(x) = x , 0 <x<1/2
1/2 , 1/2 < x <1
in this question , I am not convinced that a_ 0 = 0 for half range sine series , because i found that
but , thoerically , for half rang sine series , a_ 0 must be = 0 , ,am i right ? why the value of A- 0 that i got is not = 0 ? what's wrong with my working ?