a calculator with 4 functions!!!
http://wiki.answers.com/Q/What+is+a+basic+4+functi...

1. Define what the function is. Set a rule where "y = some function of x. If you are working with a word problem, read the problem carefully to determine how you will set up
http://www.ehow.com/how_2246932_calculateinverse...

A four function calculator can add, subtract, multiply, and divide. The Casio fx260 is an inexpensive scientific calculator. It boasts 144 functions. Don Source(s): http://www.casio.com
http://answers.yahoo.com/question/index?qid=200906...

1. Learn what is a periodic function. A periodic function repeats its form in known interval of time. That is. f. ( t. = f. ( t. n. T ) where. n. is any integer. These intervals are
http://www.wikihow.com/CalculatetheFourierTrans...
