The Animated Tangent and Secant

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The Animated Tangent and Secant

The Sine and Cosine

The triangle touching the unit circle at points (x,y) determines the sine and cosine functions.

a vertical leg, THE SINE FUNCTION, with endpoints at (x,y) - a point on the circle - and (x,0) - a point on the x-axis,
a horizontal leg, THE COSINE FUNCTION, with end points at (x,0) and the origin, (0,0), and
a hypotenuse, length (or radius) of 1, with endpoints at the origin and the point (x,y) on the circle.

For detailed information on the sine and cosine functions, go to Function and Relation Library: Trigonometric Functions - sine or cosine.

Zero Degrees, Zero Radians, Zero

First Quadrant

90 Degrees, /2 Radians,

Second Quadrant

180 Degrees, Radians,

Third Quadrant

270 Degrees, 3/2 Radians, 3/2

Fourth Quadrant

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© 2007, Agnes Azzolino
www.mathnstuff.com/math/spoken/here/2class/330/unittan.htm

	Zero Degrees, Zero Radians, Zero
	First Quadrant
	90 Degrees, /2 Radians,
	Second Quadrant
	180 Degrees, Radians,
	Third Quadrant
	270 Degrees, 3/2 Radians, 3/2
	Fourth Quadrant