why trigonometric functions also called as circular functions??

Asked by  | 9th Jun, 2013, 01:03: PM

Expert Answer:

Trigonometric functions are sometimes called circular functions. This is because the two fundamental trigonometric functions – the sine and the cosine – are defined as the coordinates of a point  P  travelling around on the unit circle of radius  1 .

As  P  moves around the circle of radius  1, the input variable – the angle  q  – changes. The outputs – cos(q) and sin(q) – give the  x  and  y  coordinates of  P, respectively.

Answered by  | 9th Jun, 2013, 07:46: PM

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