sin²30°+cos²30°－tan²45°

来源：学生作业帮助网编辑：作业帮时间：2024/05/07 05:50:36

sin²30°+cos²30°－tan²45°
sin²30°+cos²30°－tan²45°

sin²30°+cos²30°－tan²45°
sin²30°+cos²30°-tan45°
=(1/4)+(3/4)-1
=1-1
=0