How to enter ‘ (prime) in WeBWorK on your iPhone

April 11, 2019 / Jonas Reitz / 0 Comments

By default, the iPhone automatically converts straight quotes like this: ‘
into smart quotes, like this ` . You need to turn this functionality off in order to enter the prime (straight quote) symbol in WeBWorK. The short version is:

To turn smart punctuation off, all you have to do is go to Settings > General > Keyboard, and then turn off the “Smart Punctuation” toggle.

More detailed instructions can be found here:

https://www.howtogeek.com/344310/how-to-turn-off-smart-punctuation-on-your-iphone-and-ipad/

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Study of continuous periodic probability distribution
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Some interesting ODEs I am contemplating (just two).
The ODE is as follows: $$y''+1/y'=y,y(0)=0,y'(0)=1$$ $$y''+1/y=y', y(0)=1,y'(0)=0$$ The first one I multiply by $y'$ to get the following ODE: $y'=\sqrt{y^2-2x}$, don't know how to resolve this ODE though. The second ODE, again I should do the same trick of multiplying the equation by $y'$ to get: $\frac{1}{2}(y')^2+\ln(y)=\int^x (y')^2 dx$. Here I guess I could […]
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I need solve this problem but i'm really having problems What i had done: $$xy''=tan(y')$$ $$\text{use: }u=y'$$ $$xu'=tan(u)$$ $$\text{We will find } u=arcsin(Cx)$$ So I thought of replacing the u in $y'=arcsin(Cx)$ $$\frac{dy}{dx}=arcsin(Cx)$$ $$dy=arcsin(Cx)dx$$ And after that integrate to find y. Does this make sense for this exercise? I don't know if the method I […]
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I am struggling to solve this problem with the Fourier Transform??? I transform every term and factor out F(w), but from there the other side of the equation = 0, and I don't know how to proceed. Please help me.
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been looking to better understand how to find the solution to the system $\vec{x}'=\begin{pmatrix}1&-26\\1&-1\end{pmatrix}\vec{x}+\begin{pmatrix}4\\0\end{pmatrix}cos(5t)$ using the method of undetermined coefficients, now given that the associated homogenous system $\vec{x}'=A\vec{x}$ has eigenvalues of $\lambda=\pm 5i$ I know the regular guess of $\vec{x}_p=\vec{a}cos(5t)+\vec{b}sin(5t)$ won't work, I've also read somewhere that when this happens we try the guess $\vec{x}_p=\vec{a}cos(5t)+\vec{b}sin(5t)+\vec{c}tcos(5t)+\vec{d}tsin(5t)$ […]
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How to enter ‘ (prime) in WeBWorK on your iPhone

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The OpenLab at City Tech:A place to learn, work, and share

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