sin21-cos20+sin69===多少初三三角函数算式,有会的指点一下.要过程详细.谢谢~题写错了,抱歉。应该是: sin21-cos45+sin69==多少?
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![sin21-cos20+sin69===多少初三三角函数算式,有会的指点一下.要过程详细.谢谢~题写错了,抱歉。应该是: sin21-cos45+sin69==多少?](/uploads/image/z/8578235-11-5.jpg?t=sin21-cos20%2Bsin69%3D%3D%3D%E5%A4%9A%E5%B0%91%E5%88%9D%E4%B8%89%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E7%AE%97%E5%BC%8F%2C%E6%9C%89%E4%BC%9A%E7%9A%84%E6%8C%87%E7%82%B9%E4%B8%80%E4%B8%8B.%E8%A6%81%E8%BF%87%E7%A8%8B%E8%AF%A6%E7%BB%86.%E8%B0%A2%E8%B0%A2%7E%E9%A2%98%E5%86%99%E9%94%99%E4%BA%86%EF%BC%8C%E6%8A%B1%E6%AD%89%E3%80%82%E5%BA%94%E8%AF%A5%E6%98%AF%EF%BC%9A++sin21-cos45%2Bsin69%3D%3D%E5%A4%9A%E5%B0%91%EF%BC%9F)
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sin21-cos20+sin69===多少初三三角函数算式,有会的指点一下.要过程详细.谢谢~题写错了,抱歉。应该是: sin21-cos45+sin69==多少?
sin21-cos20+sin69===多少
初三三角函数算式,有会的指点一下.要过程详细.谢谢~
题写错了,抱歉。应该是:
sin21-cos45+sin69==多少?
sin21-cos20+sin69===多少初三三角函数算式,有会的指点一下.要过程详细.谢谢~题写错了,抱歉。应该是: sin21-cos45+sin69==多少?
sin21-cos45+sin69
=sin21+cos21-cos45
=根号2*sin(21+45)-cos45
sin21-cos20+sin69===多少初三三角函数算式,有会的指点一下.要过程详细.谢谢~题写错了,抱歉。应该是: sin21-cos45+sin69==多少?
sin21度cos81度-sin69度cos9度=?
cos20=?
cos24度cos69度+sin24度sin69度=?
sin21°cos81°-sin69°cos9°
求值:sin21°cos81°-sin69°cos9°
sin21°cos81°+cos189°sin69°化简
cos20/cos10=?
cos20*cos40*cos80=?
sin21°cos39°+cos21°sin39°=
sin21°cos81°-cos21°sin81°=?
sin21°cos9°+cos21°sin9°=?
为什么根号(sin20-cos20)^2=cos20-sin20
Sin25°Cos20°+ Cos20°Sin20°=
cos20*sin50*cos70/cos10=
cos20°+cos70°=
cos65-cos20+sin65-sin20=?
sin21°cos81°+sin69°cos9°化简要详解