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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.
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Jun
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accepted Distinction between vectors and points
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17
answered Why do we take a derivative?
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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.
Jun
17
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).
Jun
17
asked Distinction between vectors and points