求值sin21°cos24°+cos21°sin24°过程
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求值sin21°cos24°+cos21°sin24°过程
求值sin21°cos24°+cos21°sin24°过程
sin21°cos24°+cos21°sin24°
(sin39° -sin21°)/(cos39°-cos21°)
sin21°cos39°+cos21°sin39°=
sin21°cos81°-cos21°sin81°=?
sin21°cos9°+cos21°sin9°=?
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)
求sin39°-sin21°/cos39°-cos21°的值急需过程,谢谢!
(cos^2 33°-cos^2 57°)/(sin21°-cos21°)
(sin24°cos6°-sin66°sin6°)/(sin21°cos39°-cos21°sin39°)化简后得
求值:sin21°cos81°-sin69°cos9°
求值:sin21/4π tan(-23/6π) cos1500°
sin21 cos21等于几?精确啊
sin21度 cos21度 tan38度等于多少?
求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°)
1.比大小:tan21°和tan31°;2.sin21°和cos21°;3.cos21°和cos22°遇到这样的题目该怎么解?2.把正整数1,2,3,4,5.按如下规律排列:12,3,4,5,6,7,8,9,10,11,12,13,14,15,.按此规律,可知第n行有多少个正整数?不只要
sin21°cos81°-sin69°cos9°