Second test post

;; turn on and off gui. bars.
(defun my-all-bar-mode (&optional n)
  "turn on or off scroll bar, tool bar, menu bar."
  (interactive)
  (if (eq n nil) (setq n (if menu-bar-mode -1 1)))
  (if (fboundp 'scroll-bar-mode) (scroll-bar-mode n))
  (if (fboundp 'tool-bar-mode) (tool-bar-mode n))
  (if (fboundp 'menu-bar-mode) (menu-bar-mode n))
)

Above should be code. how to highlighted code?

todo : view in opera.

Sum of a^2, b^2 and c^2 is

a^2+b^2+c^2

how to display mode latex.

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