"a=4 x+1/diff(f(y),y)";
b := 3*(4*x + 1)/(diff(f(y), y)*(3*x + 1));
subs((4*x + 1)/diff(f(y), y) = a, b);
 

how can i use curve fitting tools for get m and n in this equation  for excel data

equation

i want to get m and n?

New_Microsoft_Excel_Worksheet.xlsx

hi . i want to get maximize in dsolve numeric y(t) D(y)(t) and y(t) double dot

restart;
with(plots);
with(Optimization);
sol := {diff(y(t), t, t) + 2*diff(y(t), t) + 4*y(t) = 0.9*sin(9*t), y(0) = 0, D(y)(0) = 0};
so := dsolve(sol, numeric, method = rkf45);
plots:-odeplot(so, [t, y(t)], t = 0 .. 4);
Maximize(??????);
 

hello. i write this code for use 6 cpu cores but it write 4

i want to write a expression without any quotes . for example in this case i want to wrate E*1    E*2