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 Feb13 awarded Yearling Jul2 awarded Curious Feb13 awarded Yearling Sep29 awarded Popular Question Feb13 awarded Yearling Nov18 awarded Nice Answer Jun8 awarded Constituent Jun8 awarded Caucus Feb13 awarded Yearling Jan10 awarded Announcer Aug3 comment Find equation for a function of form: $f(x) = Ae^{kx} \cos(Bx+C)+D.$? $D$ is the function value when $\cos{(Bx+C)} = 0$. Since the function has a maximum at $0$, $C = 0$. You can find $B$ by finding the period of the function. At each maximum $\cos (Bx+C)$ = 1, so $Ae^{kx}$ decides the height at the maximums. Aug3 answered $u$-substitution into integral Jun23 accepted Distinction between vectors and points Jun17 answered Why do we take a derivative? Jun17 comment Distinction between vectors and points Thank you. This helps a lot. Jun17 comment Distinction between vectors and points @Qiaochu: They started the first chapter by saying that they would use bold face for vectors. Therefore I assumed that the point $\textbf x$ is also a vector. Jun17 comment Distinction between vectors and points Thank you. I have not heard about affine spaces before, but what you say makes sense to me. Jun17 comment Distinction between vectors and points @Qiaochu: It may be a little unclear. What I mean is that they call it a point and use vector notation (bold face). Jun17 asked Distinction between vectors and points Jun16 comment Counting words of varying length made out of a restricted alphabet It's not a permutation. In a permutation, the number of objects is kept constant. You have the same number of objects (and also the same objects) before you permute as after.