sin21°cos189°-sin69°sin9°的值为
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sin21°cos189°-sin69°sin9°的值为sin21°cos189°-sin69°sin9°的值为sin21°cos189°-sin69°sin9°的值为sin21°cos189°-si
sin21°cos189°-sin69°sin9°的值为
sin21°cos189°-sin69°sin9°的值为
sin21°cos189°-sin69°sin9°的值为
sin21°cos189°-sin69°sin9°
=-sin21°cos9°-cos21°sin9°
=-(sin21°cos9°+cos21°sin9°)
=-sin(21°+9°)
=-sin30°
=-1/2
sin21°cos189°-sin69°sin9°
=-sin21°cos9°-cos21°sin9°
=-(sin21°cos9°+cos21°sin9°)
=-sin(21+9)°
=-1/2
sin21°cos81°+cos189°sin69°化简
sin21°cos189°-sin69°sin9°的值为
sin21°cos189°-sin69°sin9°的值为
sin21°cos81°-sin69°cos9°
求值：sin21°cos81°-sin69°cos9°
sin21°cos81°+sin69°cos9°化简要详解
cos24°cos69°-sin24°sin69°等于多少
sin21度cos81度-sin69度cos9度=?
(sin39° -sin21°)/(cos39°-cos21°)
sin21°cos39°+cos21°sin39°=
sin21°cos24°+cos21°sin24°
sin21°cos81°-cos21°sin81°=?
求值sin21°cos24°+cos21°sin24°过程
求值sin21°cos24°+cos21°sin24°过程
sin21°cos9°+cos21°sin9°=?
求sin21°+sin22°+...+sin289°的值.
求值：sin21/4π tan(-23/6π) cos1500°
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)