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Aw o the trigonometric functions o an angle θ can be constructit geometrically in terms o a unit circle centred at O.

Trigonometry (frae Greek trigōnon, "triangle" an metron, "meisur"[1]) is a branch o mathematics that studies relationships involvin lenths an angles o triangles.

ReferencesEedit

  1. "trigonometry". Online Etymology Dictionary.