Use the Half angle Formula to find the exact value of the expression sin Which Half angle Formula should be used to find sin Select the correct choice below and fill in the answer box to complete your choice Simplify your answer Type an exact answer using as needed Use integers or fractions for any numbers in the expression OB Sin OA sin OC sin OE in G sin 1 cos 2 1 sin D 2 1 sin 2 1 cos 2 OD sin OF sin OH sin 5 1 cos 2 1 sin 1 sin 2 1 cos