作业帮sin²60°-tan45°×cos60°-tan²60° 根号（cos60°-1）²+sin60°-1的绝对值急
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sin²60°-tan45°×cos60°-tan²60° 根号（cos60°-1）²+sin60°-1的绝对值急
sin²60°-tan45°×cos60°-tan²60° 根号（cos60°-1）²+sin60°-1的绝对值
急
sin²60°-tan45°×cos60°-tan²60° 根号（cos60°-1）²+sin60°-1的绝对值急
=( √3/2)²-1×1/2-(√3)²
=3/4-1/2-3
=-2又3/4
根号（cos60°-1）²+sin60°-1的绝对值
=1-cos60°+1-sin60°
=1-1/2+1-√3/2
=3/2-√3/2