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Why It Is Called Sine? [Solved]
In trigonometry, the name “sine” comes through Latin from a Sanskrit word meaning “chord”. In the picture of a unit circle below, AB has length sinθ and this is half a chord of the circle. The co-functions are functions of complementary angles: cosθ = sin(π/2 − θ), cotθ = tan(π/2 − θ), and cscθ = sec(π/2 − θ).
Where do Sin, Cos and Tan Actually Come From - Origins of Trigonometry - Part 1
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Why are Sine & Cosine given their names?
Why are the trig ratios
Origin of the Sine Function Part 1
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