cosc等于根号三

cosc等于根号三sinc

cosc等于根号三sinc...cosc等于根号三sinc

cos等于根号三是多少度

cos等于根号三是多少度...cos等于根号三是多少度

cosc+(cosa-根号三sina)cosb=0求角a

cosc+(cosa-根号三sina)cosb=0求角a...cosc+(cosa-根号三sina)cosb=0求角a

cosx=根号3

cosx=根号3...cosx=根号3

cosa—根号三sina

cosa—根号三sina...cosa—根号三sina

cos-根号3sin

cos-根号3sin...cos-根号3sin

cosa=根号3/3

cosa=根号3/3...cosa=根号3/3

cosc+(cosa-根号3sina)cosb=0

cosc+(cosa-根号3sina)cosb=0...cosc+(cosa-根号3sina)cosb=0

cosx等于-根号3/2

cosx等于-根号3/2...cosx等于-根号3/2

cosx=-根号3/3

cosx=-根号3/3...cosx=-根号3/3