[Santa]余弦函数的值计算

Cos的值（单位：度）
cosd(1)
= 0.99984769515639123916
cosd(5)
= 0.9961946980917455323
cosd(10)
= 0.98480775301220805937
cosd(15)
= 0.96592582628906828675
cosd(20)
= 0.93969262078590838405
cosd(25)
= 0.90630778703664996324
cosd(30)
= 0.86602540378443864676
cosd(35)
= 0.81915204428899178968
cosd(40)
= 0.7660444431189780352
cosd(45)
= 0.7071067811865475244
cosd(50)
= 0.64278760968653932632
cosd(55)
= 0.57357643635104609611
cosd(60)
= 0.5
cosd(65)
= 0.42261826174069943619
cosd(70)
= 0.34202014332566873304
cosd(75)
= 0.25881904510252076235
cosd(80)
= 0.17364817766693034885
cosd(85)
= 0.087155742747658173558
cosd(89)
= 0.017452406437283512819

90度不做考虑

@星月之殇magic

复制粘贴的→_→

废话，我算了好长时间，都记载在备忘录里了