9. Use a change of variables to evaluate the following definite integral.\\ $\int_0^2 \frac{2x}{(x^2+4)^3} dx$\\ Determine a change of variables from $x$ to $u$. Choose the correct answer below.\\ A. $u = x^2 + 4$\ B. $u = x^2$\ C. $u = 2x$\ D. $u = (x^2 + 4)^3$\\ Write the integral in terms of $u$.\ $\int_0^2 \frac{2x}{(x^2+4)^3} dx = \int_4^{ } \text{ } du$\\ Evaluate the integral.\ $\int_0^2 \frac{2x}{(x^2+4)^3} dx = $\ (Type an exact answer.)
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In this case, we can let u = x + 4. To find the differential du, we can differentiate both sides of the equation u = x + 4 with respect to x: du/dx = 1 Now, we can solve for dx: dx = du Substituting this into the original integral, we have: ∫(2x/(x+4)) dx = Show more…
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