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2009-10-29T19:47:31+01:00
Oblicz kofunkcję (dla sin, cos, tg, ctg) następujących kątów: 120°,240°,300°.
sin 120° =sin(90° + 30° ) = cos 30° = √3/2
cos 120° =cos(90° + 30° ) = - sin 30° = - 1/2
tg 120° = tg (90° + 30° ) = - ctg 30° = - √3
ctg 120° = ctg(90° + 30° ) = - tg 30°= - √3/3

sin 240° =sin(270° - 30° ) = - cos 30° = -√3/2
cos 240° =cos(270° - 30° ) = - sin 30° = - 1/2
tg 240° = tg (270° - 30° ) = +ctg 30° = + √3
ctg 240° =ctg(270° - 30° ) = +tg 30°= + √3/3

sin 240° =sin(270° + 30° ) = - cos 30° = - √3/2
cos 240° =cos(270° + 30° ) = + sin 30° =+ 1/2
tg 240° = tg (270° + 30° ) = - ctg 30° = - √3
ctg 240° = ctg(270° + 30° ) = - tg 30°= - √3/3

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