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    How Do You Integrate cos[(pi/9)(x^2)]?

    Homework Statement Integrate cos[(pi/9)(x^2) Homework Equations Is there a trig identity for the cos(x^2) ? The Attempt at a Solution U=(pi/9)T^2 dU= [2(pi)/9] (T)dT dT= dU/ {[2(pi)/9 (T)]} Substitute in get cosU dU/ {[2(pi)/9 (T)]} Now what?