Grammar and usage are the sine qua non of language teaching and learning.
La gramática y el uso son la condición sine qua non de la enseñanza y el aprendizaje de idiomas.
The functions sine and cosine take values between -1 and 1 (-1 and 1 included).
Las funciones seno y coseno toman valores entre -1 y 1 (-1 y 1 incluidos).
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