sin21°cos81°-sin69°cos9°
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sin21°cos81°-sin69°cos9°sin21°cos81°-sin69°cos9°sin21°cos81°-sin69°cos9°Sin21°Cos81°-Sin69°Cos9°=Sin
sin21°cos81°-sin69°cos9°
sin21°cos81°-sin69°cos9°
sin21°cos81°-sin69°cos9°
Sin21°Cos81°-Sin69°Cos9°
=Sin21°Cos81°-coc21°sin81°
=sin（21°-81°）
=sin（-60°）
=-sin60°
=（-√3）/2.
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sin21°cos81°-sin69°cos9°
求值：sin21°cos81°-sin69°cos9°
sin21°cos81°+cos189°sin69°化简
sin21°cos81°+sin69°cos9°化简要详解
sin21°cos81°-cos21°sin81°=?
sin21度cos81度-sin69度cos9度=?
sin21°cos189°-sin69°sin9°的值为
sin21°cos189°-sin69°sin9°的值为
sin57-sin33+2√2cos81*sin69
cos54°cos9°+sin54°cos81°
三角运算cos54°cos351°+sin144°cos81°
cos24°cos69°-sin24°sin69°等于多少
(sin39° -sin21°)/(cos39°-cos21°)
sin21°cos39°+cos21°sin39°=
sin21°cos24°+cos21°sin24°
求值sin21°cos24°+cos21°sin24°过程
求值sin21°cos24°+cos21°sin24°过程
sin21°cos9°+cos21°sin9°=?