1/2sin30°+根2/2cos45°+sin60°*cos60°=?
问题描述:
1/2sin30°+根2/2cos45°+sin60°*cos60°=?
答
1/2sin30°+根2/2cos45°+sin60°*cos60°
=1/2x1/2+√2/2x√2/2+√3/2x1/2
=1/4+1/2+√3/4
=3/4+√3/4