homework. homework /.2 solve points Part 1 of 2 Points: 0 of 2 Save Use the half-angle identities to evaluate sin 112.50 exactly. . . . Which half-angle formula should be used to find the exact value of sin 112.5 ? Select the correct choice below and fill in the answer boxes to complete your choice. (Do not include the degree symbol in your answers.) 1 - COS O A. sin 112.50 = sin 2 2 1+ cos O B. sin 112.50 = sin 2 2 1 - COS O C. sin 112.50 = sin 2 2 1+ cos O D. sin 112.50 = sin 2 2