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If t = 3x is substituted, the integral of cos 3x becomes:
A-sin 3x / 3
Bsin 3x / 3
C3 sin 3x
Dsin x / 3
Answer & Solution
Correct answer: B. sin 3x / 3
With t = 3x, dx = dt/3 and the integral of cos t is sin t, giving sin 3x / 3.
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