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After many failed attempts to derive the parallel postulate from other axioms , the study of the still hypothetical hyperbolic geometry by Johann Heinrich Lambert ( 1728 – 1777 ) led him to introduce the hyperbolic functions and compute the area of a hyperbolic triangle ( where the sum of angles is less than 180 ° ) .
 person: Johann Heinrich Lambert
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Text: {0} 
Answer:
 person: Johann Heinrich Lambert