2sin20°+(cos10°/cos20°)=

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2sin20°+(cos10°/cos20°)=
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2sin20°+(cos10°/cos20°)=
2sin20°+(cos10°/cos20°)=

2sin20°+(cos10°/cos20°)=
2sin20°+(cos10°/cos20°)
=(2sin20°cos20°+cos10°)/cos20°
=(sin40°+cos10°)/cos20°
=(sin40°+sin80°)/cos20°
=2sin60°cos20°/cos20°
=2sin60°
=√3

看是要哪种结果啊,计算器也可以算