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Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(iCos[i \[Pi])Pi/k])];
 i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])Cos[Pi/5]), 1/(1 + Cos[(3Cos[3 \[Pi])Pi/5])}

I have tried Hold and its several versions, but nothing seems to do the trick.

Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(i \[Pi])/k])];
i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])/5]), 1/(1 + Cos[(3 \[Pi])/5])}

I have tried Hold and its several versions, but nothing seems to do the trick.

Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[i Pi/k])];
 i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[Pi/5]), 1/(1 + Cos[3 Pi/5])}

I have tried Hold and its several versions, but nothing seems to do the trick.

2 edited body
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Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(i \[Pi])/k])];
i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])/5]), 1/(1 + Cos[(23 \[Pi])/5])}

I have tried Hold[]Hold and its several versions, but nothing seems to do the trick.

Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(i \[Pi])/k])];
i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])/5]), 1/(1 + Cos[(2 \[Pi])/5])}

I have tried Hold[] and its several versions, but nothing seems to do the trick.

Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(i \[Pi])/k])];
i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])/5]), 1/(1 + Cos[(3 \[Pi])/5])}

I have tried Hold and its several versions, but nothing seems to do the trick.

1
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How can I prevent Mathematica from evaluating or "simplifying" an expression?

Simple example:

k = 5;
list = {};
For[i = 1, i <= k - 2,
 AppendTo[list, 1/(1 + Cos[(i \[Pi])/k])];
i = i + 2];
Print[list];

{1/(1+1/4 (1+Sqrt[5])),1/(1+1/4 (1-Sqrt[5]))}

I want the expression to be kept and printed as:

{1/(1 + Cos[(\[Pi])/5]), 1/(1 + Cos[(2 \[Pi])/5])}

I have tried Hold[] and its several versions, but nothing seems to do the trick.