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Megan Larson, Eric Echard, Nicholas Spry
AMTNYS 2009 Unsolved Mysteries Trig Functions Megan Larson, Eric Echard, Nicholas Spry
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I saw the Sine Jya Abbreviated form of “Jya-ardha” meaning“Chord-half”
Jiba/Jb Phonetic translation in Arabic Jaib Meaning “cove” or “bay” Sinus Latin word for “cove” or “bay” Sine: “the half-chord of the double of the central angle.” - “Where in the Sine is a Chord?” by Robert Rogers
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Cosine: “Complement’s sine”
What Goes Where? Sine: “Half-chord” Cosine: “Complement’s sine” Tangent: “Tangere,” meaning “to touch” (Latin) Secant: “Secare” meaning “to cut” (Latin) Cotangent: Complements tangent Radius Cosecant: Complement of secant
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Mysteries of Secant and Cosecant
sec(θ) tan(θ) B E 1 Similar Triangles by AAA F sin(θ) B C cos(θ) θ □ □ θ □ θ □
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Mysteries of Secant and Cosecant
Similar Triangles by AAA E cot (θ) H csc(θ) B □ θ F sin(θ) B C cos(θ) □ θ θ □ θ □
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