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 Apr 18 awarded Popular Question Feb 13 awarded Yearling Aug 7 awarded Notable Question Feb 13 awarded Yearling Jul 2 awarded Curious Feb 13 awarded Yearling Sep 29 awarded Popular Question Feb 13 awarded Yearling Nov 18 awarded Nice Answer Jun 8 awarded Constituent Jun 8 awarded Caucus Feb 13 awarded Yearling Jan 10 awarded Announcer Aug 3 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. Aug 3 answered $u$-substitution into integral Jun 23 accepted Distinction between vectors and points Jun 17 answered Why do we take a derivative? Jun 17 comment Distinction between vectors and points Thank you. This helps a lot. Jun 17 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. Jun 17 comment Distinction between vectors and points Thank you. I have not heard about affine spaces before, but what you say makes sense to me.