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Prove that (sin (4A - 2B) + sin (4B - 2A...

Prove that `(sin (4A - 2B) + sin (4B - 2A))/(cos (4A - 2B) + cos (4B - 2A)) = tan (A + B)`

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The correct Answer is:
`(sin (A + B))/(cos (A + B)) = tan (A + B) `
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