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