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...[[Ptolemy's table of chords|calculation of chords]], while mathematicians in India created the earliest-known tables of values for trigonometric ratios Throughout history, trigonometry has been applied in areas such as [[geodesy]], [[surveying]], [[celestial mechanics]], and [[na ...

...es are fundamental building blocks of [[digital electronics]] systems used in computers, communications, and many other types of systems. ...h a circuit is described as [[sequential logic]] in electronics. When used in a [[finite-state machine]], the output and next state depend not only on it ...

...g problem for all possible program–input pairs. The problem comes up often in discussions of [[computability]] since it demonstrates that some functions ...cidability as it means no program {{var|f}} will solve the halting problem in every possible case. ...