Given that a and B are opposite to each other, and ab is not equal to 0, CD is reciprocal to each other, find the value of a + B-Cd + a of 2013

Given that a and B are opposite to each other, and ab is not equal to 0, CD is reciprocal to each other, find the value of a + B-Cd + a of 2013

The original formula = (0-1 + (- 1)) / / 2013 = 2 / 2013