求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
问题描述:
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
答
右边2sin(π/6+A)=2sin(π/6)cosA+2sinAcos(π/6)=cosA+根号3sin(A)=左式.得证#
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
右边2sin(π/6+A)=2sin(π/6)cosA+2sinAcos(π/6)=cosA+根号3sin(A)=左式.得证#