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HP 9g graphing calculator Manual

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E-15
When you enter a numeric value or numeric expression and press [ ],
the result is stored in the Answer function, which you can then quickly recall.
See Example 19.
Note: The result is retained even if the power is turned off. It is also retained
if a subsequent calculation results in an error.
Chapter 4 : Common Math Calculations
Logarithm and Antilogarithm
You can calculate common and natural logarithms and antilogarithms using
[ log ], [ ln ], [ 2nd ] [ 10
x
], and [ 2nd ] [ e
x
]. See Example 20.
Fraction Calculation
Fractions are displayed as follows:
5
┘
12 =
56 U 5
┘
12 =
• To enter a mixed number, enter the integer part, press [ A b/c ], enter
the numerator, press [ A b/c ], and enter the denominator. To enter an
improper fraction, enter the numerator, press [ A b/c ], and enter the
denominator. See Example 21.
• During a calculation involving fractions, a fraction is reduced to its
lowest terms where possible. This occurs when you press [ + ], [ – ],
[ × ], [ ] ) or [ ]. Pressing [ 2nd ] [ A b/c d/e ] converts a
mixed number to an improper fraction and vice versa. See Example
22.
• To convert a decimal to a fraction or vice versa, press [ 2nd ]
[ F D ] and [ ]. See Example 23.
• Calculations containing both fractions and decimals are calculated in
decimal format. See Example 24.
Converting Angular Units
You can specify an angular unit of degrees (DEG), radians (RAD), or grads
(GRAD). You can also convert a value expressed in one angular unit to its
corresponding value in another angular unit.
The relation between the anglular units is :
180° = π radians = 200 grads
… 15 …


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