2 cos 3x
Asked by maham237 @ in Mathematics viewed by 231 People
Using the expansions of cos(3x − x) and cos(3x + x), prove that
1/2(cos 2x − cos 4x) ≡ sin 3x sin x.
Asked by maham237 @ in Mathematics viewed by 231 People
Using the expansions of cos(3x − x) and cos(3x + x), prove that
1/2(cos 2x − cos 4x) ≡ sin 3x sin x.
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