# Tag Info

## Hot answers tagged expression-manipulation

3

Try the following: Coefficient[f[r, ϕ], Cos[ϕ]]

2

Try rather using the following syntax for your replacement: ( <expr> ) /. { x -> 3.14 } In your case, probably something like: FullSimplify[ (\[Tau] - ArcCos[a[\[Tau]]/b[\[Tau]]]/ Sqrt[b[\[Tau]]^2 - a[\[Tau]]^2]) /. {\[Delta] -> 0.05, \[Beta] -> 1.77, n -> 12} ] See the explanation on Applying Transformation Rules: On the ...

1

It seems the current version (10.3) is now aware of the Meijer $G$ expressions for the order derivatives (see this math.SE answer as well): Derivative[1, 0][StruveL][0, z] // FunctionExpand BesselK[0, z] - MeijerG[{{1/2, 1/2}, {}}, {{0, 0, 1/2, 1/2}, {}}, z/2, 1/2]/(2 π^2) (The last version I used, version 8, was unable to do this, if memory ...

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