\( \left. \begin{array} { l } { \int ( \frac { 1 } { x ^ { 2 } + 1 } - \cos ( 5 x ) \sin ( 5 x ) ) d x = } \\ { [ ( 1 - 1 \sin ( 10 x ) ) } \end{array} \right. \)
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The Deep Dive
The integral you've got here involves two different functions: the arctangent function (related to \( \frac{1}{x^2 + 1} \)) and a product of sine and cosine. The first part, \( \int \frac{1}{x^2 + 1} dx \), gives the classic result \( \tan^{-1}(x) + C \), while the second part simplifies through the double angle identity, where \( \sin(5x) \cos(5x) = \frac{1}{2} \sin(10x) \). So, you might be looking for an overall expression involving those results. Now, if we integrate this expression properly, we come up with a solution reminiscent of classic calculus techniques! Your final answer for the integral would be something like: \[ \tan^{-1}(x) - \frac{1}{2} \sin(10x) + C \] Make sure to include the constant of integration to account for those calculations!
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