求值sin50°(1+根号3tan10°)求详细过程和文字说明
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求值sin50°(1+根号3tan10°)求详细过程和文字说明
sin50°(1+根号3tan10°)
=sin50°(cos10°+根号3sin10°)/cos10°
=2sin50°sin40°/cos10°
=sin100°/cos10° 再答: =sin100°/cos10° =1
再答: =sin100°/cos10° =cos10°/cos10°=1
再答: sin50°(1+根号3tan10°) =sin50°(cos10°+根号3sin10°)/cos10° =2sin50°(1/2cos10°+根号3/2sin10°)/cos10° =2sin50°sin40°/cos10° =sin100°/cos10° =cos10°/cos10°=1
=sin50°(cos10°+根号3sin10°)/cos10°
=2sin50°sin40°/cos10°
=sin100°/cos10° 再答: =sin100°/cos10° =1
再答: =sin100°/cos10° =cos10°/cos10°=1
再答: sin50°(1+根号3tan10°) =sin50°(cos10°+根号3sin10°)/cos10° =2sin50°(1/2cos10°+根号3/2sin10°)/cos10° =2sin50°sin40°/cos10° =sin100°/cos10° =cos10°/cos10°=1
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