1/cos80º-根号3/sin80º=?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/03 08:04:33
1/cos80º-根号3/sin80º=?
1/cos80-根号3/sin80
=1/sin10°-(根号3)/cos10°
=(cos10°-(根号3)sin10°)/(sin10°×cos10°)
=2(1/2 cos10°- (根号3)/2 sin10°))/(sin10°×cos10°
=2(sin30°cos10°-cos30°sin10°)/(sin10°×cos10°)
=2sin20°/(sin10°×cos10°)
=4sin20°/(2sin10°×cos10°)
=4sin20°/sin20°
=4
=1/sin10°-(根号3)/cos10°
=(cos10°-(根号3)sin10°)/(sin10°×cos10°)
=2(1/2 cos10°- (根号3)/2 sin10°))/(sin10°×cos10°
=2(sin30°cos10°-cos30°sin10°)/(sin10°×cos10°)
=2sin20°/(sin10°×cos10°)
=4sin20°/(2sin10°×cos10°)
=4sin20°/sin20°
=4
1/cos80º-根号3/sin80º=?
计算 1/cos80-根号3/sin80
如何证明:(1除cos80度)减(根号3除以sin80度)=4
计算(1/cos80)-(√3/sin80)
1/sin10度 - 3的根号/sin80度=?
不查表,计算1/sin10°-(根号3)/sin80°=
1/sin10°-根号3/sin80°=
1/sin10度---根号3/COS80度=
1/sin10°-根号3/sin80°
sin50度(1+根号3tan10度)-cos20度/cos80度根号1-cos20度=
化简:(cos10°+根号下3sin10°)/根号下(1-cos80°)=
(sin50(1+根号3*tan10)-cos20)/cos80根号(1-cos20)