trigonometric function

1. Any function of an angle expressible as the ratio of two of the sides of a right triangle that has that angle (e.g., sine), or that subtracts 1 from such a ratio or subtracts such a ratio from 1 (e.g., coversed sine).

   trigonometrische Funktion

   тригонометри́ческая фу́нкцияtrigonometríčeskaja fúnkcija

   function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle

1. The derivatives of the inverse trigonometric functions are algebraic.

   deDie Ableitungen der inversen trigonometrischen Funktionen sind algebraisch. — quicksanddiver

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2. The trigonometric functions satisfy a wide array of notable algebraic identities.

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3. I think that for many people learning the trigonometric functions is meaningless.

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4. The trigonometric functions sine, cosine, and tangent relate the various sides and angles of a triangle.

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