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To use the \cancel method in Shiny MathJax, you can simply insert it as a LaTeX expression using the dollar sign delimiter. For example, if you want to strikeout the number "5" in your app, you can use the following code:

ui <- fluidPage(
  mainPanel(
    HTML('Here is a canceled number: $\\cancel{5}$')
  )
)

server <- function(input, output) {}

shinyApp(ui, server)

This will render a text element with a strikethrough line over the number 5, like this:

Here is a canceled number: 5

You can adjust the size, color and style of the strikethrough line using CSS, or by specifying additional options in the LaTeX expression.