What is trigonometry?!
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Trigonometry is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.
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=> Trigonometry is the branch of mathematics in which we have to study about the relation between the angles of right angled Δ.
=> We have to read Sine, Cosine, Secant,Cosecant, Tanget and Cotangent in this.
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