化简cos24°cos36°-cos66°cos54°cos58°sin37°+sin122°sin53°cos(π/3+θ)+cos(π/3-θ)cos(α-β)cos(α+β)+sin(α-β)sin(α+β)
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化简cos24°cos36°-cos66°cos54°cos58°sin37°+sin122°sin53°cos(π/3+θ)+cos(π/3-θ)cos(α-β)cos(α+β)+sin(α-β)sin(α+β)
化简
cos24°cos36°-cos66°cos54°
cos58°sin37°+sin122°sin53°
cos(π/3+θ)+cos(π/3-θ)
cos(α-β)cos(α+β)+sin(α-β)sin(α+β)
化简cos24°cos36°-cos66°cos54°cos58°sin37°+sin122°sin53°cos(π/3+θ)+cos(π/3-θ)cos(α-β)cos(α+β)+sin(α-β)sin(α+β)
cos24°cos36°-cos66°cos54°=cos24°cos36°-sin24sin36=cos(24+36)=cos60=1/2
cos58°sin37°+sin122°sin53°=cos58°sin37°+sin58°cos37=sin(58+37)=1
cos(π/3+θ)+cos(π/3-θ)=2*cos[(π/3+θ)+(π/3-θ)]/2*cos[(π/3+θ)-(π/3-θ)]/2=cosθ
cos(α-β)cos(α+β)+sin(α-β)sin(α+β)=cos[(α-β)-(α+β)]=cos2β
=1/2
cos24°cos36°- cos66°cos54°的值.
cos24°cos36°-cos66°cos54°=?有会做的么?
cos24°cos36°-cos66°cos54°=?求详解
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°?
化简cos24°cos36°-cos66°cos54°cos58°sin37°+sin122°sin53°cos(π/3+θ)+cos(π/3-θ)cos(α-β)cos(α+β)+sin(α-β)sin(α+β)
cos24°*cos36°-sin24°*cos54°等于多少,
cos24°cos36°-sin24°sin36°=
为什么cos24度cos36度-cos66度cos54度这么算cos24度cos36度-cos66度cos54度=cos24 cos36 - sin24 sin36=cos (24+36)=cos 60=1/2很多人都这么算那个cos66度 和cos54度上哪去了
sin18°cos36°
COS66°20′等于多少RT
化简sin6°cos24°sin78°cos48°
化简cos12°cos24°cos48°cos84°=
cos24°cos54°-sin24°cos144°=?
cos24°cos54°-sin24°cos144°急!
cos24°-sin6°-cos72°
化简√(1-2sin24°cos24°)+sin24°