[Tex]\large\underline{\sf{what is trigonometry}}[Tex]
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Basic Trigonometric Function Formulas
By using a right-angled triangle as a reference, the trigonometric functions and identities are derived: sin θ = Opposite Side/Hypotenuse. cos θ = Adjacent Side/Hypotenuse. tan θ = Opposite Side/Adjacent Side. sec θ = Hypotenuse/Adjacent Side.
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the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
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