sin^2C=sin(A+B)*sin(A-B)
sin^2[180-(A+B)]=sin(A+B)*sin(A-B)
sin^2(A+B)=sin(A+B)*sin(A-B)
sin(A+B)=sin(A-B)
sin(A+B)=sinAcosB+cosAsinB(1)
sin(A-B)=sinAcosB-cosAsinB(2)
(1)=(2)
cosAsinB=0
cosA=0 (A=90°) 或sinB=0(舍去)
所以,三角形是直角三角形
sin^2C=sin(A+B)*sin(A-B)
sin^2[180-(A+B)]=sin(A+B)*sin(A-B)
sin^2(A+B)=sin(A+B)*sin(A-B)
sin(A+B)=sin(A-B)
sin(A+B)=sinAcosB+cosAsinB(1)
sin(A-B)=sinAcosB-cosAsinB(2)
(1)=(2)
cosAsinB=0
cosA=0 (A=90°) 或sinB=0(舍去)
所以,三角形是直角三角形