C = - 4 x [( 2 + 11) - (3 - 1 )] D = - 1 + 2
31 3 6 12 3 2 3
C=-4/31 * [(2/3 + 11/6) - (2/12 - 1/3)]
= -4/31 * [(4/6 + 11/6) - (2/12 - 4/12)]
= -4/31 * [(15/6) - (-2/12)]
= -4/31 * [(15/6) + 1/6]
= -4/31 * (16/6)
= -4/31 * 8/3
= - 32 / 93
D = -1/2 + 2/3
= -3/6 + 4/6
= 1/6
