反正切

arc tangent(inverse tangent)

• yorke peninsula
• york mystery plays
• yorkshire
• yorkshire terrier
• yorktown
• yorktown campaign
• york，alvin cullum
• york，archbishop of
• york，house of
• york，prince andrew，duke of
• york，richard plantagenet， 3rd duke of
• yoruba
• yosemite national park
• yoshida
• yoshida shigeru
• yoshino
• yoshino period
• you
• young
• younger
• younger brothers
• young-eyed
• younghusband，sir francis edward
• young ireland
• young italy