543857+45326

Plus[42354,65436]

var

var * 2

var*var

var var 3 + var

Expand[var(var+3)]

4!

123!

123!/453126745000

N[123!]

123.!

6.5!

Gamma[6.5+1]

-3.4!

1234/12

12

12.

1234./12

1234/12.

(1234/12-1234./12)/(1234/12)

pi

Pi

Pi=3.5

pi= 3.5

pi

pi-3

alpha+beta-alpha

α^2+β-(α^2)

2 Pi

2. Pi

Pi^E

Pi^E.

N[Pi^E]

Sin[Pi]

Sin[N[Pi]]

( )     priority

[ ]    function evaluation

{ }   list constructor

[[ ]]   access to list

(* *)    just a comment

Sin[a]

Sin[a+Pi]

Sin[a,b]

Sin[Pi,b]

2^1024

2.^1024

(2.^1024-2^1024)/(2^1024)

(2^1024-2.^1024)/(2^1024)

Plus[a,4,Pi,b,Paolo]

Pi^2/6

s=Sum[1/i^2,{i,1,Infinity}]

s1=N[Sum[1/i^2,{i,1,Infinity}]]

s2=NSum[1/i^2,{i,1,Infinity}]

(s1-s)/s

(s2-s)/s

Pi^I

Sqrt[-3]

?Plot

?Fourier*

?*Fourier

?*Plot3D*

?Pi

N[123/65+6556/435]

123/65+6556/435//N

N[Pi]

N[Pi,100]

Pi//N

Pi^2//Sin//Cos//Exp//N

f[x]

x//f

f@x

f[x]==(x//f)

{1,-2,3.4,Pi}

{1,-2,3.4,Pi,,Sin[t],Exp[3,4],Paolo,"Paolo",3+4.I}

{4,-3,{},{5,6,7}}

{{a,b,c},{2,3,4},{Pi,E,I}}

{{a,b,c},{2,3,4},{Pi,E,I}}//MatrixForm

{{a,b},{2,3,4,5},{Pi,E,I},{}}

{{a,b},{2,3,4,5},{Pi,E,I},{}}//MatrixForm

k {{a,b},{2,3,4,5},{Pi,E,I},{}}

k + {{a,b},{2,3,4,5},{Pi,E,I},{}}

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[1]]

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[3]]

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[-1]]

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[6]]

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[0]]

Sin[3+E]//TreeForm

Sin[3+E][[1]]

Sin[3+E][[2]]

Sin[2+E][[0]]

Sin[2+E]//Head

{a,b,{2,3,4},5,{Pi,E,I,{}}}[[3,2]]

{a,b,{2,3,4},5,{Pi,E,I,{}}}  [[3]]   [[2]]

{1,2,3,4}//MatrixForm

Transpose[{1,2,3,4}]

{{1,2,3,4}}

{{1,2,3,4}}//MatrixForm

Transpose[{{1,2,3,4}}]

Transpose[{{1,2,3,4}}]//MatrixForm

Eigenvalues[{{1,2,3},{-2,3.,-1},{0,1,2.}}]

Eigenvalues[{{1,2,3},{-2,3.,-1},{α,1,2.}}]

Power[exp,pow]

f[exp1,exp2]

f[exp1][exp2]

(f[exp1])[exp2]

{1,-3,4}+{a,b,c}

{1,-3,4}*{a,b,c}

{1,-3,4}+{a,b}

{1,-3,4}*{a,b}

Plot[Sin[t],{t,100,100+2Pi}]

Plot[Sin[2t],{t,100,100+2Pi}]

Plot[Sin[1/t^2],{t,100,100+2Pi}]

Plot3D[
(Sin[t]^2+Cos[z]^2)/Sqrt[(t^2+z^2)],
{t,-1,2},{z,-2,2}]