1 cost sint Choose the sequence of steps below that verifies the identity O A OB sint 1 cost O C 1 cost 1 cost sin t sin t 1 cost sin t 1 cost sin t OD 1 cost sin t 1 cost sin t 1 cost sin t 1 cost sin t 1 cost 1 cost 1 cost 1 cost 1 cost 1 cost 1 cost 1 cost 1 cos t sin t 1 cos t 1 cos t sin t 1 cos t 1 cos t sin t 1 cost 1 cos t sin t 1 cost sin t sin t 1 cost sin t sint 1 cost sin t sin t 1 cost sin 2t sin t 1 cost sin t 1 cost sin t 1 cost sin t 1 cost sint 1 cost