Hey Raisa! I am currently a PhD student in mathematics, but I was also a mechanical engineering undergrad before I switched to math. I would say that...
Direct comparison requires the integrand to not change sign, right? The cosine changes sign over $[0,\infty)$, so direct comparison will not do with...
Let's generalize the method I posted >>>here<<< to reflect a given point $(a,b)$ about the line $y=mx+k$, where ($m\ne0$). We will call the reflected...