If 2cosAsinB = x, then the value of x is?

If 2cosAsinB = x, then the value of x is?
1). sin(A+B) + sin(A-B)
2). cos(A+B) + cos(A-B)
3). sin(A+B) - sin(A-B)
4). cos(A-B) - cos(A+B)

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