8+9+b

b=99;

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

Cos[4]
Cos[4.]
(* 4-Integer, 4.-Real *)

cos[4.] (* chyba *)

N[Cos[5]]

(* ruzne volani funkce *)

N[Cos[5]];
N@Cos[5];
Cos[5]//N;

N[Pi]
N[Pi,20]

(* esc pi esc *)

ClearAll[π]
π=22

ClearAll[b]

b=Vul;

b

N[1/70]

funkce=(1+(z^2))*Sin[2*z];

aaa12;
12aaa;

x=Vul

Plot[funkce,{z,0,15}];
Plot[(1+(z^2))*Sin[2*z],{z,0,15},PlotStyle->{Red,Thick},AxesLabel->{"x","fce[x]"}]

ClearAll[x]

Int=Integrate[(x^12)*Cos[x],x];

Plot[Int,{x,-10,10},PlotRange->All]

FindRoot[(E^(2*x))==Sin[3*x],{x,0}]