cos10°是什么意思?
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发布时间:2024-08-18 14:16
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热心网友
时间:2024-08-22 01:44
1+√3tan10°
=1+√3sin10°/cos10°
=(cos10°+√3sin10°)/cos10°
=2sin(10°+30°)/cos10°
=2sin40°/cos10°
sin50°(1+√3tan10°)
=(2sin40°sin50°)/cos10°
=[cos(50°-40°)-cos(50°+40°)]/cos10°
=cos10°/cos10°
=1