sin45°/(cos60°-tan60°)+cos45°×cos30°=.

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 08:41:28

sin45°/(cos60°-tan60°)+cos45°×cos30°=.
sin45°/(cos60°-tan60°)+cos45°×cos30°=.

sin45°/(cos60°-tan60°)+cos45°×cos30°=.
sin45°/(cos60°-tan60°)+cos45°×cos30°
=(√2/2)/(1/2-√3)+√2/2×√3/2
=.√2/(1-2√3)+√6/4
=√2(1+2√3)/(1-12)+√6/4
=√6/4-(√2+2√6)/11
=(11√6-4√2-8√6)/44
=(3√6-4√2)/44