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`int_(-pi)^(pi)x^(3)cos^(3)xdx=?`A. `pi`B. `(pi)/(4)`C. `2pi`D. `0` |
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Answer» `f(x)=x^(3)cos^(3)x`. `:.f(-x)=(-x)^(3)[cos(-x)]^(3)=-x^(3)(cosx)^(3)=-(x^(3)cos^(3)x)=-f(x)` `:.f(x)` is odd and hence `I=0`. |
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