# What is trigonometry

What is trigonometry
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Trigonometry is the study of triangles. It is the branch of mathematics that deals with the relationship between angles and sides in triangle. There are six trigonometric function namely sine, cosine, tangent, secant, cosecant and cotangent functions. These trigonometric functions has been used to find the angles and sides of triangle.
In a right angled triangle, if $\theta$ is called the opposite side, and the side opposite to 90∘ is called hypotenuse side and the other side of the triangle is called adjacent side. The trigonometric ratios are defined as follows: