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The value of the integral $\displaystyle{}\int_{-1}^1 \dfrac{x^2}{1+x^2} \sin x \sin 3x \sin 5x dx$ is 

  1. $0$
  2. $\frac{1}{2}$
  3. $ – \frac{1}{2}$
  4. $1$
in Calculus
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$0$?
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