Mark M. answered 05/29/20
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
If f(-x) = -f(x), then f(x) is an odd function.
For f(x) = x2sinx / (1 + x6), the function is odd since sin(-x) = -sinx.
For odd functions, ∫(from -a to a) f(x) dx = 0
So, the value of the given integral is 0.