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Simple Question: How to simplify what is inside the Sin function like below?
I have this code of Mathematica
(1/(2 (fj - fk) π))
Cos[(fj - fk) π T + (fj - fk) π (T + δt)] Sin[(fj -
fk) π T - (fj - fk) π (T + δt)]
There are a few ...