sin58°cos37°-cos58°sin37°
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sin58°cos37°-cos58°sin37°
cos13°cos58°+sin13°sin58°怎么算
利用两角和(差)大的余弦公式化简cos58°cos37°+sin58°sin37°cos(60°+)-cos(60°-θ)cos(60°+θ)+cos(60°-θ)
化简cos58°cos37°+cos32°cos53°
化简cos58°cos37°+cos32°cos53°……貌似有好多原题,可是都不大懂呢,
cos37°=?
用和差角公式化简,化简sin58'cos37'-cos58'sin37'和sin(a b)cosb cos(a-b)sinb 这两个题应该怎么化?我在自学三角函数,希望能把思路和步骤写详细一些!
﹣sin347°×cos32°×cos58°×sin77°=
sin347°cos148°+sin77°cos58°化简
sin347°cos148°+sin77°cos58°
sin347°cos148°+sin77°cos58°怎么算?
Cos32°Cos28°-Cos58°Cos62°
cos37° 等于cos多少π
sin347°cos148°+sin77°cos58°等于多少,要具体过程,谢谢
求sin347°cos148°+sin77°cos58°的值
cos58°sin37°+sin122°sin53°求解,写清过程···
sin53°cos37°+cos53°sin37°=?
sin7°cos37°-sin83°cos307°=