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B
a>0 and b>0 only
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C
a>0 and b<0 only
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D
a<0 and b<0 only
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Solution
The correct option is A any values of a and b ∫1−1(ax3+bx)dx=0 Since, f(x)=ax3+bx is an odd function. So its value within the given limit will always be 0. Hence, this holds for any values of a and b .