求值(2sin80°-cos70°)÷cos20°如题
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求值(2sin80°-cos70°)÷cos20°如题
求值(2sin80°-cos70°)÷cos20°
如题
求值(2sin80°-cos70°)÷cos20°如题
√3
(2sin80°-cos70°)÷cos20°
=[2sin(60°+20°)-sin20°]÷cos20°(正弦和差化积公式展开)
=(√3cos20°+sin20°-sin20°)÷cos20°
=√3
求值:(2sin80°-cos70°)/cos20°
求值(2sin80°-cos70°)÷cos20°如题
化简求值(2sin80`-cos70`)/cos20`
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(2cos20°-sin10°)/sin80°化简求值
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2sin80度-cos70度/cos20度=?
(2sin80º-cos70º)除以cos20º=?
求值2sin20°+2cos20°+cos70°sin10°/sin70°
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求值:sin10°sin50°sin70°sin80°
求值:1/sin10°-根号3/sin80°
化简求值;(1-sin80°)/cos80°
求值:1/sin10°-√3/sin80°
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