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\( \left. \begin{array} { l } { \int y ^ { 2 } \sin n y d y } \\ { \int x a ^ { x } d x = a ^ { x } } \end{array} \right. \)

Ask by Elliott Whittaker. in Dominican Republic
Feb 21,2025

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Para resolver la primera integral \( \int y^2 \sin(ny) \, dy \), se utiliza la integración por partes y se obtiene: \[ \int y^2 \sin(ny) \, dy = -\frac{1}{n} y^2 \cos(ny) + \frac{2}{n^2} y \sin(ny) + \frac{2}{n^3} \cos(ny) + C \] Para la segunda integral \( \int x a^x \, dx \), se aplica la regla de integración para funciones exponenciales y se encuentra: \[ \int x a^x \, dx = \frac{x a^x}{\ln(a)} - \frac{a^x}{(\ln(a))^2} + C \] En resumen, las soluciones son: 1. \( \int y^2 \sin(ny) \, dy = -\frac{1}{n} y^2 \cos(ny) + \frac{2}{n^2} y \sin(ny) + \frac{2}{n^3} \cos(ny) + C \) 2. \( \int x a^x \, dx = \frac{x a^x}{\ln(a)} - \frac{a^x}{(\ln(a))^2} + C \)

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The Deep Dive

Did you know that the integral of \( y^2 \sin(ny) \, dy \) can be approached using integration by parts? You would typically apply it twice, where you let \( u = y^2 \) and \( dv = \sin(ny) \, dy \). The process might seem daunting, but the results can lead to some beautiful solutions that involve sinusoidal functions and polynomial expressions intermingling! Now, let's talk about the second integral! The expression \( \int x a^x \, dx = a^x \left( \frac{x}{\ln(a)} - \frac{1}{(\ln(a))^2} \right) + C \) shows a fun interplay of exponential functions and their derivatives. This formula is derived using integration by parts, and it's a great example of how exponential growth behaves uniquely in calculus. Keep it handy for when you encounter similar problems!

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