Open Question: What does the u stand for in sin(2u)=2sin(u)cos(u)?
I have just been given this formula but no one has explained what the u stand for? Also there is the formula; sin(u +or- v) = cos(u)sin(v) +or- sin(u)cos(v)
Does the u stand for the same thing here? What does the v stand for?
Please help!
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