## Trigonometry

### Trigonometry is a branch of mathematics that deals with the relationships between the angles and sides of triangles

Trigonometry is a branch of mathematics that deals with the relationships between the angles and sides of triangles. It helps us understand and solve problems involving triangles, such as finding missing side lengths or angles.

Trigonometry is based on the concept of trigonometric ratios, which are ratios of the lengths of the sides of a right triangle. The three primary trigonometric ratios are sine (sin), cosine (cos), and tangent (tan). These ratios are defined as follows:

– Sine (sin): The sine of an angle in a right triangle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse.

– Cosine (cos): The cosine of an angle in a right triangle is defined as the ratio of the length of the adjacent side to the length of the hypotenuse.

– Tangent (tan): The tangent of an angle in a right triangle is defined as the ratio of the length of the side opposite the angle to the length of the adjacent side.

Trigonometric ratios can be used to find unknown side lengths or angles in a right triangle. For example, if we know the length of one side and the measure of one angle, we can use trigonometry to find the lengths of the other sides or the measures of the other angles.

In addition to the primary trigonometric ratios, there are reciprocal trigonometric ratios such as cosecant (csc), secant (sec), and cotangent (cot). These ratios are the reciprocals of sine, cosine, and tangent, respectively.

Trigonometry has many real-world applications, especially in fields such as engineering, physics, and astronomy. It is used to solve problems involving distances, heights, angles of elevation and depression, navigation, and more. Many practical problems can be transformed into trigonometric problems and solved using trigonometric functions and formulas.

Overall, trigonometry provides us with a powerful set of tools to analyze and understand the geometry of triangles, making it an essential branch of mathematics.

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