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trigonometric function
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Diagram of a right triangle labeled with sides a, b, and hypotenuse c, alongside formulas for the six trigonometric functions-sine, cosine, tangent, cosecant, secant, and cotangent-each defined by ratios of the triangle's sides. Diagram of a right triangle with a yellow interior, green outline, green angle θ, red right-angle square, and sides labeled a, b, and c. Four graphs display the curves of sine, cosine, tangent, and cotangent functions, each labeled with x- and y-axes, key angles in radians, and typical wave or asymptote patterns.
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Trigonometric functions
Based on the definitions, various simple relationships exist among the functions....
Encyclopædia Britannica, Inc.
Right triangle diagram with labeled sides and angles
Illustration of a right triangle showing the opposite side (or perpendicular) a,...
Encyclopædia Britannica, Inc.
Graphs of some trigonometric functions
Note that each of these functions is periodic. Thus, the sine and cosine functions...
Encyclopædia Britannica, Inc.
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