Sharp EL9900C EL-9900C - Page 52

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. A Note about Degrees and Radians 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 calculation. Example • Calculate cosine 60°. M A 2 6 0 E 42