cos36°的值为

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cos36°的值为

来源：baiyundou.net 日期：2024-08-22

9月15日，荣耀在线上召开了秋季新品发布会，正式推出了荣耀X40手机，荣耀MagicBook X系列笔记本以及MagicBook V14 2022笔记本等新品。

荣耀X40手机的机身正面是6.67英寸120Hz高刷的45°曲面OLED屏幕，全局激发亮度可达800nit，屏幕支持1920Hz频率的高频PWM调光，采用了屏幕指纹解锁方案。手机拥有彩云追月、琥珀星光，墨玉青以及幻夜黑四种款式，内置5100mAh电池，厚度为7.9mm，机身重量为172g，兼顾了轻薄手感和长续航的使用体验，相机后置主摄为5000万像素。

MagicBook V14 2022笔记本的屏幕分辨率为2520*1680，支持触控操作并拥有90Hz刷新率，机身最高可选配英特尔酷睿i7-12700H处理器，提供16GB LPDDR5内存和512GB的固态硬盘，全尺寸的键盘拥有1.5mm的长键程，可搭配100W的氮化镓充电器，15分钟的充电就可进行2.7小时的办公操作。

值得一提的是，这款笔记本配有TOF摄像头与500万像素的双摄组合，不仅支持隔空翻页，隔空加速以及隔空暂停等隔空手势操作，而且还可拍摄90°超广角视野的内容和标准视角画面，还支持了1440P的高清录像，荣耀分享和多屏协同功能也应有尽有。

新款荣耀MagicBook X系列笔记本包括有MagicBook X 14 2022和MagicBook X 16 2022两款产品，提供冰河银的配色，其中MagicBook X 14 2022配备了一块分辨率为2240*1400的屏幕，机身厚度仅有15.9mm，重量仅为1.34kg，MagicBook X 16 2022的屏幕分辨率则为1920*1200，该系列笔记本最高可搭载英特尔12代酷睿i5-12500H标压处理器，支持1TB的固态存储扩展，同样拥有荣耀分享和多屏协同功能。

其它发布会上发布的新品包括有荣耀平板X8，真无线蓝牙耳机Earbuds X3以及荣耀亲选视海卫家儿童手表，荣耀平板X8是一块10.1英寸主打教育影音的产品，Earbuds X3耳机内置有12mm发声单元，支持40dB主动降噪并可提供36小时的长续航。

价格方面，荣耀X40手机的起售价为1499元（6GB+128GB），荣耀MagicBook V14 2022的首发优惠起售价是5999元，MagicBook X系列的首发优惠起售价均是4699元，荣耀平板X8的起售价1199元（4GB+128GB），Earbuds X3耳机售价249元，荣耀亲选视海卫家儿童手表的价格是329元。

此外，荣耀表示，将在2022年第四季度发布全新的MagicOS 7.0，MagicBook V14 2022也将在年底获得MagicOS 7.0的系统更新。

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穆俩垄3333cos36度等于sin多少度?
邓泻昌13429942646 ______ cos36=sin54,当然它必须在角度制中才成立,即36,54的单位必须都为度

穆俩垄3333cos36°cos72°的值要具体过程. -
邓泻昌13429942646 ______[答案] 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

穆俩垄333336°的余弦 cos36°=?用二倍公式结果带根号要过程PLEASE~~SOS~~~~~ -
邓泻昌13429942646 ______[答案] 求cos36有很多方法,即使你是初中生也可以看懂,我也两种 1.相似三角形法. 做三角形ABC,∠A=108,∠B=∠C=36,过A作AD交BC于D,使∠ADC=72 那么∠ADC=∠DAC=72,∠B=∠ADB=36,所以AD=DB,DC=AC 令AB=x,BD=a,因为三角形...

穆俩垄3333求 sin 18°cos 36°的值! -
邓泻昌13429942646 ______[答案] 利用二倍角公式 sin 18°cos 36° = 2sin 18°cos18°cos 36°/2cos18° =sin36°cos 36°/(2cos18°) =2sin36°cos 36°/(4cos18°) =sin72°/(4cos18°) =cos18°/(4cos18°) =1/4

穆俩垄3333怎样求cos36(不用计算器) -
邓泻昌13429942646 ______[答案] 构造图形法: 已知在△ABC中,AB=AC,点D在AC上,且BD=BC=AD,求△ABC各角的度数. 利用等腰三角形及三角形内角和定理容易求得∠ABC=∠C=∠BDC=72°, ∠A=∠ABD=∠DBC=36°. 进一步,不难发现△ABC∽△BDC,于是有, 因此...

穆俩垄3333计算:sin 36度等于多少
邓泻昌13429942646 ______ 【1】0<sin36°<1.【2】cos36°=sin(90°-36°)=sin54°.cos36°=1-2sin²18°,sin54°=3sin18°-4sin³18°.设x=sin18°,4x³-2x²-3x+1=0,(x-1)(4x²+2x-1)=0,4x²+2x-1=0,x=(-2±√20)/8,x=(√5-1)/4.【3】cos36°=1-2(√5-1)²/16=1-(3-√5)/4=(√5+1)/4.sin36°=√(1-cos²36°)=(1/4)√[4²-(6+2√5)]=(1/4)√(10-2√5).

穆俩垄3333已知cos72度等于四分之(根号五—1),求cos36度的值 -
邓泻昌13429942646 ______[答案] cos2X=2*(cosX)^2-1 cos72°=2*(cos36°)^2-1=四分之(根号五—1)

穆俩垄3333cos36度等于sin54度吗 -
邓泻昌13429942646 ______ cosx=sin(90-x) 所以cos36度=sin54度

穆俩垄3333求cos36° - sin18°的值. -
邓泻昌13429942646 ______[答案] cos36=1-2sin218°, sin18°=cos72=2cos236°-1, 设x=cos36,y=sin18,则 x=1-2y2,① y=2x2-1,② ①+②得 x+y=2x2-2y2=2(x+y)(x-y), ∵x+y≠0 ∴x-y= 1 2,即cos36°-sin18°= 1 2

穆俩垄3333cos72°—cos36°=___ - -
邓泻昌13429942646 ______[答案] cos72°-cos36°=cos(54+18)-cos(54-18)=[cos54cos18-sin54sin18]-[cos54cos18+sin54sin18]=-2sin54sin18 (sin54=cos36)=-2cos36sin18 =-2cos36sin18cos18/cos18 =-cos36sin36/cos18 =-sin72/(2cos18) =-sin72/(2sin...

（编辑：自媒体）