(2sin5°-cos25°)\(cos65°)=?( 根号下1-2sin10°cos10°)\(根号下1-cos^21
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/06 15:09:13
(2sin5°-cos25°)\(cos65°)=?( 根号下1-2sin10°cos10°)\(根号下1-cos^2170°-cos350°)=?
(2sin5°-cos25°)\(cos65°)
=(2sin5°-cos(30-5)°)\(cos65°)
=(2sin5°-(√3/2cos5°+1/2sin5°)\(cos65°)
=(3/2sin5°-√3/2cos5°)/(cos65°)
=√3(√3/2sin5°-1/2cos5°)/(cos65°)
=-√3(sin(30-5))/(cos65°)
=-√3
=(2sin5°-cos(30-5)°)\(cos65°)
=(2sin5°-(√3/2cos5°+1/2sin5°)\(cos65°)
=(3/2sin5°-√3/2cos5°)/(cos65°)
=√3(√3/2sin5°-1/2cos5°)/(cos65°)
=-√3(sin(30-5))/(cos65°)
=-√3
(2sin5°-cos25°)\(cos65°)=?( 根号下1-2sin10°cos10°)\(根号下1-cos^21
根号下(1-2sin10°cos10°)除以cos10°-根号下(1-cos^2 10°)
1、根号下1-2sin10°*cos10°除以cos10°-根号下1-cos²170°
化简根号下(1-2sin10°cos10°)/[cos10°-根号下(1-sin^2 80°)]
求值,根号下1-2sin10°cos10°/cos10°-根号下1-sin^2100°
化简:(cos10°+根号下3sin10°)/根号下(1-cos80°)=
化简:根号(1+2sin10°cos10°)
根号 1+2sin10°cos10° 怎样化简
〔cos40°(cos10°+根号3sin10°)〕/ (2cos^25°-1)
化简 根号下sin的平方10°-2sin10°cos10°+cos的平方10°
1/sin10°-根号3/cos10°=
化简:(根号1-2sin10°×cos10°)比sin10°-根号1-sin^210°