Which expression is equivalent to sin(1.8x) sin(0.5x)?
O A.
0.5[sin(2.3x) + sin(1.3x)]
O B.
0.5[sin(2.3x) - sin(1.3x)]
O c.
0.5[cos(1.3x) - cos(2.3x)]
O D.
0.5[cos(2.3x) - cos(1.3x)]