What are the primary trigonometric functions?

The primary trigonometric functions are sine, cosine, and tangent. These functions are used to describe the relationships between the sides and angles of a right triangle. Sine is the ratio of the length of the side opposite an angle to the length of the hypotenuse. Cosine is the ratio of the length of the side adjacent to an angle to the length of the hypotenuse. Tangent is the ratio of the length of the side opposite an angle to the length of the side adjacent to that angle. These functions are essential in trigonometry and have many applications in mathematics, science, technology, and engineering.

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