EntityQ1328149· pop 21· linked from 33 articlesGudermannian functionSign in to savefunction that relates the circular functions and hyperbolic functions without using complex numbersConnectionstrigonometric functionEntityhyperbolic functionEntityhyperbolic geometryEntityFrenchEntityInternational Standard Book NumberEntityangleEntitylatitudeEntityreal numberEntitydigital object identifierEntitygeodesyEntityradianEntitynavigationEntityGerardus MercatorEntityspiral galaxyEntityTaylor seriesEntityelectric potentialEntitycomplex analysisEntityJSTOREntitygraph of a functionEntityQ118398EntityCategoriesElementary special functionsExponentialsSigmoid functionsTrigonometry