cos6°cos54°cos66°等于多少?最好有具体公式,
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cos6°cos54°cos66°等于多少?最好有具体公式,
cos24°cos36°- cos66°cos54°的值.
cos24°cos36°-cos66°cos54°=?有会做的么?
cos24°cos36°-cos66°cos54°=?求详解
cos6 cos42 cos66 cos78cos6*cos54*cos66=1/4 * cos18why? thanks
cos24°cos36°-cos66°cos54°到sin66°cos36°-cos66°sin36°是怎么来的
三角恒等变换问题cos24°cos36°-cos66°cos54°的值为__?为什么?
cos24°cos36°- cos66°cos54 =sin66°cos36°-cos66°sin36° =sin(66°-36°) =sin30° =1/2 24°cos36°- cos66°cos54是怎么 =sin66°cos36°-cos66°sin36°?
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sin36°cos6°-sin54°cos84°等于多少?
sin54°cos36°+cos54°sin36°
cos54°cos9°+sin54°cos81°
cos24°cos54°-sin24°cos144°=?
三角运算cos54°cos351°+sin144°cos81°