# All Questions

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### How do you collect trigonometric functions in a polynomial?

I have an expression that has various forms of Sin and Cos and I want to collect them specifically so that I can make substitutions. As you can see I cannot figure out how to separate i Cos[theta] ...
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### Help in finding Probability distribution table [on hold]

A discrete random variable X has probability function given by f(x)= k x^3 for x=1,2,3,4. Then find a. Value of k b. Probability at x=2 c. Mean of X d. Variance of X e. Probability distribution ...
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### How to obtain this expression in terms of real functions

I know that this expression (2 (ArcCot[E^(-((I ϕ)/2)) r] + ArcCot[E^((I ϕ)/2) r]))/π is real, because is the sum of a real series, in particular: ...
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### Plotting a data of protein diffusion trajectory [on hold]

I have a set of data points of protein diffusion in x-y plane. They are sequential in time i.e, recorded at regular intervals of 20ms. Now, I need to plot a line plot in 2 dimensions, which connects ...
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### Plot values of parameter [on hold]

Noob-alert: I have a Mathematica notebook with a lot of engineering formulas and several inputs. I want to plot one of these formulas as a function of one of the inputs. The formula in question is ...