Evaluate the Integral. (Sqrt(x^2 -9))/x^3 dx Trigonometric Substitution

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At 4:47 there seems to be an error: the antiderivative of 2 * cos 2θ is sin 2θ, not 1/2 * sin 2θ as shown.

note that d(1/2 * sin 2θ)/dθ is cos 2θ, not 2 * cos 2θ .

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simple and to the point. excellent video

capdevilajose