Example 19 - Prove cos 2x cos x/2 - cos 3x cos 9x/2 = sin 5x
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Example 19 - Prove cos 2x cos x/2 - cos 3x cos 9x/2 = sin 5x
Example 19Prove that cos 2x cos 𝑥/2 – cos 3x cos 9𝑥/2 = sin 5x sin 5𝑥/2Solving L.H.SSolving cos 2x cos x/2 and cos 3x cos 9𝑥/2 separatelycos 2x cos 𝒙/𝟐 Replacing x with 2x and y with 𝑥/2= 1/2 ("cos " ("2x " x/2)" cos" ("2x" −x/2))= 1/2 ("cos " ((4x x
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