1. USER INTERFACE: MENUS AND TOOLBARS7The reason behind these differences and using of≡Mathcad is thatscans your input from top to bottom and left to right as illustrated inthe following diagram.Scan StartTop-Leftto²to/RightBottomSo a variable or a function must be defined before it is used. The≡will give us a leverage to defy this scan order so we can define and use avariable (function) without worrying about the proper order demanded
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