Trigonometry Table Crewneck Sweatshirts
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Description: A detailed scientific illustration of a circle of radius R with a highlighted chord and central angle θ, ringed by stars, above the chord formula crd θ = 2R sin(θ/2), set against a deep dark background. Hipparchus of Nicaea (c. 190–120 BC) compiled the first known table of chords, the ancestor of the sine function. He also made one of the first star catalogues and discovered the precession of the equinoxes. A gift idea for mathematicians, math teachers and engineers, and a quiet statement piece for a study, classroom or office wall.
