sin54度cos18度等于几
问题描述:
sin54度cos18度等于几
答
y=sin54°cos18°=4cos36°cos18°/4=4sin18°cos18°cos36°/4sin18°=sin72°/4sin18°=1/4
sin54度cos18度等于几
y=sin54°cos18°=4cos36°cos18°/4=4sin18°cos18°cos36°/4sin18°=sin72°/4sin18°=1/4