cos45°sin²30°+2分之根号2sin²60°..

问题描述:

cos45°sin²30°+2分之根号2sin²60°..

原式=
cos45°sin²30°+cos45°sin²60°=cos45°(cos²60°+sin²60°)=cos45°=√2/2

cos45°sin²30°+2分之根号2sin²60°
=√2/2×1/4+√2/2 ×3/4
=√2/2×(1/4+3/4)
=√2/2×1
=√2/2