i need to add sin$,$con,tan to this code i tried to add it the same way as $+,*,/,-$ but it did not work and crashed. void CalFrame::OnClearButtonClick$($wxCommandEvent& event$)$

$\{$

textControl$->$Clear$()$;

$\}$

void CalFrame::OnCalculate$($wxCommandEvent& event$)$

$\{$

wxString expression $=$ textControl$->$GetValue$()$;

double result;

if $($EvaluateExpression$($expression$,$ result$))\{$

textControl$->$SetValue$($wxString::Format$("\%$g$",$ result$))$;

$\}$

else $\{$

textControl$->$SetValue$("$Error$")$;

$\}$

$\}$

void CalFrame::OnBackspace$($wxCommandEvent& event$)$

$\{$

wxString currentValue $=$ textControl$->$GetValue$()$;

if $(!$currentValue.empty$())\{$

currentValue.RemoveLast$()$;

textControl$->$SetValue$($currentValue$)$;

$\}$

$\}$

bool IsOperator$($char c$)\{$

return c $==\text{'}+\text{'}||$ c $==\text{'}-\text{'}||$ c $==\text{'}*\text{'}||$ c $==\text{'}/\text{'}$;

$\}$

std::vector Tokenize$($const wxString& expression$)\{$

std::vector tokens;

std::string number;

for $($char c : expression.ToStdString$())\{$

if $($IsOperator$($c$))\{$

if $(!$number.empty$())\{$

tokens.push$\_$back$($number$)$;

number.clear$()$;

$\}$

tokens.push$\_$back$($std::string$(1,$ c$))$; $//$ Convert char to string

$\}$

else if $($isdigit$($c$)||$ c $==\text{'}.\text{'})\{$

number.push$\_$back$($c$)$;

$\}$

$\}$

if $(!$number.empty$())\{$

tokens.push$\_$back$($number$)$;

$\}$

return tokens;

$\}$

bool CalFrame::EvaluateExpression$($const wxString & expression, double& result$)$

$\{$

std::vector tokens $=$ Tokenize$($expression$)$;

try $\{$

std::vector stack;

result $=$ std::stod$($tokens$[0])$;

for $($size$\_$t i $=1$; i $<$ tokens.size$()$; i $+=2)\{$

std::string op $=$ tokens$[$i$]$;

double nextNum $=$ std::stod$($tokens$[$i $+1])$;

if $($op $=="+")$ result $+=$ nextNum;

else if $($op $=="-")$ result $-=$ nextNum;

else if $($op $=="*")$ result $*=$ nextNum;

else if $($op $=="/")$ result $/=$ nextNum;

$\}$

return true;

$\}$

catch $($const std::exception&$)\{$

return false;

$\}$

$\}$