trigonometri
sec a = 1/cos a
cosec a = 1/sin a
cos (270° - a) = - sin a
sec (270° - a) = - cosec a
•
sec 255°
= sec (270 - 15)°
= - cosec 15°
sec 255° = - cosec 15°
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trigonometri
sec a = 1/cos a
cosec a = 1/sin a
cos (270° - a) = - sin a
sec (270° - a) = - cosec a
•
sec 255°
= sec (270 - 15)°
= - cosec 15°
sec 255° = - cosec 15°