(* 1. cviko 11:00 až 12:30
Straka, Pražák
 *)

10+9/3+11

(Sqrt[2])
(Sqrt[2.])
N[(Sqrt[2]),2000]

N[1/7]

x=9;
y=4;

x

N=5
Sin=15;

(((3+1)/3)*15)

(* ctrl+2 (Sqrt[\[Placeholder]]), ctrl+6 (x^\[Placeholder]), ctrl+/ (\[Placeholder]/\[Placeholder])*)

(Sqrt[\[Placeholder]])

(x^(((((\[Placeholder]^(\[Placeholder]^\[Placeholder]))^((\[Placeholder]^\[Placeholder])\[Placeholder]))^\[Placeholder])^\[Placeholder])^\[Placeholder]))

(Sqrt[(Sqrt[(Sqrt[(Sqrt[(Sqrt[(Sqrt[(Sqrt[81])])])])])])])

(1/4)

list={ja,ty,{on,ona,ono}}

list[[1]]
list[[3,2]]

Sin[list]/.{ja->Pi,ty->2.,ono->π}

ja

ClearAll[x]
funkce={Log[x],Cos[2*x],Sin[6x]};

Plot[funkce,{x,0,2*π},PlotLegends->"Expressions"]

(* komentář *)

Jan Votava je vul

2 5 8 9

vyraz=(a+b)*(a-b)

Expand[vyraz]

FullForm[vyraz]

FullForm[list]

TreeForm[vyraz]

TreeForm[list]

Sin[5.]
Sin@5.
5.//Sin

(Sqrt[y])//N

Plot[{Log[t+4],(t^3)*Sin[5*t+0.4]},{t,0,10},PlotStyle->{{Thick,Black},{Red,Dashed,Thick}},PlotRange->{Automatic,{-100,100}}]