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(Solved): Sin(xy)Sin(yx)=2Sin(x)Cos(y)2Cos(x)Sin(y) ...
Sin
(
x
−
y
)
−
Sin
(
y
−
x
)
=
2
Sin
(
x
)
Cos
(
y
)
−
2
Cos
(
x
)
Sin
(
y
)
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