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万性柴1340数学三角函数的45度 - ------60度------30度对应的cos sin tan 如何才能记 -
邬柳乳17748252240 ______ 45° CS一样 T为一 60° S2分之根三 C2分之1 T为根三30°CS与60°CS相反 T跟60°互为倒数 其实用图像法记最好了 我就这里打的时候都是在脑子里想图像

万性柴1340 用计算器计算cos10°,cos20°,cos30°,…,cos90°的值,总结规律,并利用此规律比较当0°<α<β<90°时,cosα与cosβ的大小,即cosα______cosβ. -
邬柳乳17748252240 ______[答案] 用计算器计算cos10°,cos20°,cos30°,…,cos90°的值,可发现在0°到90°之间,角越大,余弦值越小;故当0°<α<β<90°时,cosα与cosβ的大小,即cosα>cosβ. 故答案为>.

万性柴1340cos( - 375°)的值 -
邬柳乳17748252240 ______ 你好 cos(-375°) =cos(-15°) =cos15° =sin75° =sin(45°+30°) =sin45°cos30°+cos45°sin30° =√6/4+√2/4

万性柴1340cos角度是√5/3的角度是多少 -
邬柳乳17748252240 ______ cos值为√5/3, 即sin为2/3,tan值为2/√5, 这都不是特殊的三角函数值, 只能用计算器得到 arccos√5/3约等于41.81度

万性柴1340cos600°的值是什么 -
邬柳乳17748252240 ______ cos600 =cos(2*360-120) =cos(-120) =cos120 =-1/2

万性柴1340cos1200°的值是______. -
邬柳乳17748252240 ______[答案] cos1200°=cos(360°*3+120°)=cos120°=-cos60°=- 1 2, 故答案为:- 1 2.

万性柴1340cos36°cos72°的值 -
邬柳乳17748252240 ______ 采用凑配的方法,并且逆用二倍角公式 cos36°cos72°=(sin36°cos36°cos72°)/sin36° =(sin72°cos72°)/2sin36° =sin144°/4sin36° =sin(180°-144°)/4sin36° =1/4

万性柴1340求cos1°+cos2°+cos3°+...+cos178°+cos179°的值(这里的数字都是度数比如1°)求cos1°+cos2°+cos3°+...+cos178°+cos179°的值 -
邬柳乳17748252240 ______[答案] cos1°+cos2°+cos3°+...+cos178°+cos179° =(cos1°+cos179°)+(cos2°+cos178°)+……+(cos89°+cos91°)+cos90° =(cos1°-cos1°)+(cos2°-cos2°)+……+(cos89°-cos89°)+cos90° =cos90° =0

万性柴1340cos0°=1怎么算的 -
邬柳乳17748252240 ______ cos的值是坐标轴上横坐标的值,故为1 角度就是以坐标原点为端点,以X轴正方向为一条射线,与另外一条射线形成的角度

万性柴1340cos30°与cos44°的值一样吗 -
邬柳乳17748252240 ______[答案] 不一样,cos30º大于cos44º,角度在(0,90º)内,角度越大,余弦值越小