@Rouben Rostamian  

I only need ee thats why I put colon for yy. yy is pair of differential equation. Please help me to solve this problem.

@acer 

How to use student calculus command for two variable function say f(x,y)

@one man 

How to get all the possible solutions for f(\epsilon,\phi). fsolve gives only one solution.

@one man 

Please see below file. I need \phi and \epsilon at a particular range. fsolve then gives back unevaluated

equation_solve(1).mw
 

Download equation_solve(1).mw

@one man 

I have a function let me say f(\epsilon,\phi) I need to find minima of that function. So what I am doing is 

1)x=diff(f(\epsilon,\phi),\epsilon)

2)y=diff(f(\epsilon,\phi),\phi)

Now I am solving this fucntion to get \epsilon and \phi such that f(\epsilon,\phi) gives me minima. Condition \epsilon,\phi value should be greater than 0. 

I think my code is in agreement with what I have explained above. Please point out if there is any mistake and how to do that.

@one man 

I need to have \epsilon value greater than zero. How to give  that command. Basically I have a multivariable function for which i am finding the minima. I found the derivative of that function w.r.t \epsilon and \phi then solving those equation to get \epsilon and \phi such that it gives the minima.

@acer 

It works fine. Thanks a lot. Could you please give an idea of finding minima for multivariable function.

@Markiyan Hirnyk 

How can I get root of multivariable function. I mean the global minimum. I am getting the error 'Error, Usage is not a command in the CodeTools package' while using your first line of your above code.

@acer 

How can I do that.

@Axel Vogt 

I am confused why maple is not giving any warning in such an instance.  Anyway I will stick to MMA in this case.

@Axel Vogt 

Is there any built in command for finding singularity of a function in maple.

@Markiyan Hirnyk 

Sorry i didnt get you.

@Markiyan Hirnyk 

I used SetAccuracy command while I was having numerical rounding issue with one of the calculations for which I need to set Digits=35 in maple.

@Markiyan Hirnyk 

I think SetAccuracy in MMA is the analog of Digits of maple.

@Markiyan Hirnyk

How can I set required precision in maple.  I mean the analog of working precision of MMA.