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HP 6s Calculator - Trigonometric Functions

The HP 6s scientific calculator has one independent memory. “M” is displayed when there is a value in memory. The following table explains how to store a number in memory and how to delete it.
Key
Description
Press C/CE
To clear the display or cancel the current calculation without clearing the memory.
Press X-M
To store the displayed value in memory.
Press M+
To add the displayed value to memory.
Press RM
To retrieve the contents of memory - to determine its value or include it in the calculation.
Press INV, then X-M
To display the contents of memory and replace it with the value that was displayed before the keys were pressed.
Press AC
To clear the display and the memory (solar model).
Press OFF, then ON
To clear the display and memory (battery model).

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