2sin50°+2sin10°sin40°/cos10°
1个回答
2014-01-25
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=2(sin50°cos10°+sin10°sin40°)°/cos10°
=2(sin50°cos10°+sin10°cos50°)/cos10°
=2sin60°/sin80°
=不会了
=2(sin50°cos10°+sin10°cos50°)/cos10°
=2sin60°/sin80°
=不会了
追问
2sin60°/sin80° sin80°应该是cos10°啊
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