Sharp EL-9900 - Manual (Page 52)

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Chapter 3: Basic Calculations — Basic Keyboard
4. Calculations Using MATH Menu Items
The MATH menu contains functions used for more elaborate math concepts, such as
trigonometry, logarithms, probability, and math unit/format conversions. The MATH
menu items may be incorporated into your expressions.
Note: The default angle measurement unit while using the calculator’s
Basic Keyboard is degrees. If you wish to work in radians, then
the configuration must be changed in the SET UP menu. For
more information, see page 25.
The degree and radian systems are two of the basic methods of
measuring angles. There are 360 degrees in a circle, and “2-pi”
radians. 1 degree is equal to pi/180 radians. “Then, what’s this
pi?”, you may ask. Pi, or to use its symbol “ π”, is the ratio of the
circumference of a circle to its diameter. The value of π is the
same for any circle “3.14...”, and it is believed to have an infinite
number of digits beyond the decimal point.
A CALC
The CALC sub-menu contains items to be used in calculations
containing trigonometric and logarithmic functions.
Note: The following examples show keystrokes with keyboard shortcuts.
It is also possible to select a sub-menu item using the cursor
keys.
1 sin Enters a sine function to be used in a trigonometric calculation.
Example
• Calculate sine 90°.
M A 1 9 0 E
2 cos Enters a cosine function to be
used in a trigonometric calcula-
tion.
Example
• Calculate cosine 60°.
M A 2 6 0 E
A Note about
Degrees and
Radians