![\frac{1}{2}[sin(x+y)+sin(x-y)]](/tpl/images/0567/3360/cbc37.png)
![cos(A)sin(B)=\frac{1}{2}[sin(A+B)+sin(A-B)]](/tpl/images/0567/3360/b7f0e.png)
![cos(x)sin(y)=\frac{1}{2}[sin(x+y)+sin(x-y)]](/tpl/images/0567/3360/20d67.png)
Complete the product to sum formula.
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