SOLUTION: Simplify (sin(f+g)+sin(f-g))/(cos(f+g)+cos(f-g))

Question 931859: Simplify (sin(f+g)+sin(f-g))/(cos(f+g)+cos(f-g))
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
After expanding all 4 expressions using sum/difference identities we get:

which simplifies to

and then to

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