Differentiate ##f(x)=x\cos{x}+2\tan{x}: D/dx ##\tiny{2.4.2}##

[karush]

Homework Statement

s8.2.4.2

Relevant Equations

product rule

$\tiny{2.4.2}$
Differentiate $f(x)=x\cos{x}+2\tan{x}$
Product Rule $[-x\sin{x}+\cos{x}]+[2\sec^2]\implies \cos{x}-x\sin{x}+2\sec^2x$
mostly just seeing how posting here works

typos maybe
suggestions
what forum do I go to for tikz stuff

 

[fresh_42]

Homework Statement:: s8.2.4.2
Relevant Equations:: product rule

$\tiny{2.4.2}$
Differentiate $f(x)=x\cos{x}+2\tan{x}$
Product Rule $[-x\sin{x}+\cos{x}]+[2\sec^2]\implies \cos{x}-x\sin{x}+2\sec^2x$
mostly just seeing how posting here works

typos maybe
suggestions
what forum do I go to for tikz stuff

The typos are the same. Otherwise, use ## instead of $ for inline LaTeX and $$ for extra lines.
Here is explained how you can type formulas on PF: https://www.physicsforums.com/help/latexhelp/

 

[karush]

this did not render latex or preview

 

[fresh_42]

this did not render latex or preview

See my previous post and the quotation where I changed the $ and the missing marks ## around \tiny.

 

[karush]

still does not preview

 

[fresh_42]

still does not preview

Reload the page to enforce a rendering.

 

[karush]

got it mahalo
however don't see solved option is title

 

[berkeman]

however don't see solved option is title

We don't usually mark titles as Solved, since sometimes that status can change...

 

[karush]

$\dfrac{a}{b} \quad \frac{a}{b}$

ok I'm surprized you didn't mention \dfrac{}{} in the pdf which is the same as \displaystyle\frac{}{}

 

[fresh_42]

$\dfrac{a}{b} \quad \frac{a}{b}$

ok I'm surprized you didn't mention \dfrac{}{} in the pdf which is the same as \displaystyle\frac{}{}

It isn't my manual.

I use AutoHotkey and an entire file of keyboard shortcuts to save time. E.g. Alt+I produces
\begin{align*}

\end{align*}
with the cursor in the middle. Or \operatorname{} is Ctrl+o, again with the cursor at the right position. Similar for two dozen other shortcuts like Ctrl+u for \subseteq and Alt+u for \left. \dfrac{d}{d}\right|_{}

The advantage is that I can write Tex files as quickly as MathJax here.

Displaystyle is important if you want limits and sums within the text written with indexes positioned above and below instead of next to the symbol: $\sum_{k=0}^n$ versus $\displaystyle{\sum_{k=0}^n}$ and the same for $\lim_{n \to \infty}$ versus $\displaystyle{\lim_{n \to \infty}}.$ (Alt+- and Ctrl+-)

Edit: I also abuse AutoHotkey to kill that da** capslock!

 

[karush]

valuable to know that ... mahalo