cos24°*cos36°-sin24°*cos54°等于多少,

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cos24°*cos36°-sin24°*cos54°等于多少,cos24°*cos36°-sin24°*cos54°等于多少,cos24°*cos36°-sin24°*cos54°等于多少,cos2

cos24°*cos36°-sin24°*cos54°等于多少,
cos24°*cos36°-sin24°*cos54°等于多少,

cos24°*cos36°-sin24°*cos54°等于多少,
cos24cos36-sin24cos54=cos24cos36-sin24sin36=cos(24+36)=cos60=1/2

cos24°*cos36°-sin24°*cos54° =cos24°*sin54°-sin24°*cos54° =sin(54°-24°) =sin30° =0.5

=cos24sin54-sin24cos54=sin(54-24)=sin30=1/2