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Extra info for 15.Consumer Electronics
The two main components of a calculator are hardware and software. The hardware includes plastic and metal packaging, display, keypad, optional additional input/output devices (such as infrared, serial ports, card slots, and beeper parts to produce sound), power supply circuit, and an electronic subsystem. The electronic subsystem consists of a printed circuit board with attached electronic components and integrated circuits, including a central processing unit (CPU), display controllers, random-access memory (RAM), and the read-only memory (ROM) where the software programs are stored permanently.
This can be done by first finding the value of the largest-place digit of y, then the next largest-place digit, and so on. For example, if calculating ͙54756, first find 200, then 30, and 4 to construct the answer y ϭ 234. This method is similar to a method once taught in schools for finding square roots by hand (15). Trigonometric Function Algorithms The algorithms for computing trigonometric functions depend on using trigonometric identities and relationships to reduce arbitrarily difficult problems to more manageable problems.
Students use calculators for their mathematics and science homework, and more and more teachers are incorporating graphing calculators into their lessons. Calculators are very useful for quick, back-of-the-envelope types of problems. Even with the increasing use of computers in the workplace and in homes, people continue to buy and use calculators because they are handy, convenient, portable, and dedicated to performing a few mathematical functions well. Scientific Calculators Scientific calculators can perform trigonometric functions and inverse trigonometric functions (sin x, cos x, tan x, arcsin x, arccos x, arctan x) as well as hyperbolic and inverse hyperbolic functions (sinh x, cosh x, tanh x, arcsinh x, arccosh x, arctanh x).