Prove that sin21^(@)cos9^(@)-cos84^(@)cos6^(@)=1/4. 03:12 Find the value of sin 34^(@) +cos 64^(@)- cos 4^(@) 03:49 Prove that sin50^(@)-sin70^(@)+sin10^(@)=0 02:26 Prove that 4(cos66^(@)+sin84^(@)) = sqrt(3) + sqrt(15). 02:54 Prove that cos...
【解析】答案: -1/2 -cos36°cos96°-sin36°sin84° =-cos36°cos(90°+6)°-sin36°sin(90-6)° =cos36°sin6°-sin36°con6° =sin(6°-36°) =-sin30° =-1/2【考点提示】本题主要考查两角和(差)的正弦公式与诱导公式,需要熟练掌握相应公式,根据题目特点,利用公式灵活处理三角函数化简求...
【解析】答案: -1/2 -cos36°cos96°-sin36°sin84° =-cos36°cos(90°+6)°-sin36°sin(90-6)° =cos36°sin6°-sin36°con6° =sin(6°-36°) =-sin30° =-1/2【考点提示】 本题主要考查两角和(差)的正弦公式与诱导公式,需要熟练掌握相应公式,根据题目特点,利用公式灵活处理三角函数化简...
cos4=0.9975640502598242 cos5=0.9961946980917455 cos6=0.9945218953682733 cos7=0.992546151641322 cos8=0.9902680687415704 cos9=0.9876883405951378 cos10=0.984807753012208 cos11=0.981627183447664 cos12=0.9781476007338057 cos13=0.9743700647852352 cos14=0.9702957262759965 cos15=0.9659258262890683 cos16=0.9612616959383189 cos17=0.956...
sin(6°)=0.104528,cos(6°)=0.994522,tan(6°)=0.105104 sin(7°)=0.121869,cos(7°)=0.992546,tan(7°)=0.122785 sin(8°)=0.139173,cos(8°)=0.990268,tan(8°)=0.140541 sin(9°)=0.156434,cos(9°)=0.987688,tan(9°)=0.158384 sin(10°)=0.173648,cos(10°)=0.984808,...
cos10=0.984807753012208cos11=0.981627183447664os12=0.9781476007338057 cos13=0.9743700647852352cos14=0.9702957262759965cos15=0.9659258262890683 cos16=0.9612616959383189cos17=0.9563047559630355cos18=0.9510565162951535 cos19=0.9455185755993168cos20=0.9396926207859084cos21=0.9335804264972017 cos22=0.9271838545667874...
【解析】 ∵36°+54°=90° ,6°+84°=90°∴sin6°cos36°-sin84°cos54° =sin6°sin54°-cos6°cos54° =-cos(54°+6°) =-cos60° =-1/2 故答案为=-1/2【两角和与差的正弦函数】sin(α+β)=sinαcosβ+cosαsinβ sin(α-β)=sinαcosβ-cosαsinβ【公式的记忆要点】两角和与...
答案:B解析:∵=sin30°=sin(36°-6°)=sin36°cos6°-cos36°sin6°=sin36°cosα-sin54°cos84°,∴cosα=cos6°,故选B.答案:B 结果一 题目 若sin36°cosα-sin54°cos84°=,则α值可能为( ) A. 96° B. 6° C. 54° D. 84° 答案 B 结果二 题目 若sin36°cosα-sin54...
在使用TI-84计算器时，如果你已知sin, cos或tan的值，并希望求出对应的角度，可以遵循以下步骤。首先，确保计算器设置为度数模式，可以按"MODE"键，然后选择"Degree"选项。接着，按左上角的"2nd"键，这是TI-84计算器的"2nd"键，它用于调用其他功能。接下来，输入你所知道的三角函数值，比如cos。...
这里为你提供了sin,cos,tan不同角度的表值,精确度也很高了,相信对你有用 sin1=0.01745240643728351 sin2=0.03489949670250097 sin3=0.05233595624294383 sin4=0.0697564737441253 sin5=0.08715574274765816 sin6=0.10452846326765346 sin7=0.12186934340514747 sin8=0.13917310096006544 sin9=0.15643446504023087 ...