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13-08-2018
Mathematics

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Evaluate the integral. (remember to use absolute values where appropriate. use c for the constant of integration.) 3 cos(x) + sin(2x) sin(x)

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Аноним Аноним

13-08-2018

∫sin x sin 2x = 1/2∫ (cos x - cos 3x) dx

= 1/2 ( sinx - 1/3 sin 3x) + c

∫3 cos x = 3 sin x + c

Answer is 7/2 sin x - 1/6 sin 3x + c

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