I'm currently struggling with evaluation control when getting the derivative of a function (I dont know if that's the correct term here. Sorry, beginner). My function is of the form
f[vx_, vy_, omega_] := c1 Sin[c2] FLat[x, vy, omega] + ... + cn Sin[n] FLat[vx, vy, omega]
FLat[x_] := Dp*Sin[Cp*ArcTan[Bp*x - Ep*(Bp*x - ArcTan[Bp*x])]];
x = ArcTan[(vy + af*omega)/vx + 0.5*bf*omega] - delta1;
When I evaluate
D[f, vx], I get a horrible expression in terms of
ArcTan whereas I would prefer something in terms of
FLat'. How can I control the evaluation of that function to obrtain a nice representation of my derivative?