今年万圣节，上海的朋友们可谓是撒了欢。完美的本土化改造让街头变装主打一个有梗有料接地气。甄嬛传、海底捞、财神爷、灵魂附体，中式万圣被盆友们给玩明白了。

（图源：@陈研志、@今天你喝芋泥波波了吗、@呱呱在此）

也难怪网友们表示，上海的cos盛况，足以赶超东京涩谷（往年日本万圣节街头玩cos最活跃的地方）。

而近十年，日本人的万圣节cos衍生出了一个新的“品类”，主打一个“贫穷简陋”。“接地气cos”，今年万圣节又如约而至。

“接地气cos”顾名思义，要求参加cos的朋友们不能扮装为著名动画/游戏角色、人气明星等大家都知道的人。

此外，也不能穿着华丽，只能用最朴素、毫不起眼的装扮出场，cos生活中随处可见的人物。

在这些“严苛”的条件下，你还得让别人知道自己cos的是个啥...每一年，日本网友们的脑洞都没有瓶颈——

一点奇怪的脑洞，再配上些“简陋”的cos装备，虽然活动已经搞了10年，每年还是能整出些沙雕新活。

（cos旧电视中DVD logo的人）

P图瘦脸时用力过猛，把吸管都给P弯了的人

顾客输入密码时把头扭到一边避嫌的贴心收银员

下一站要下车，提前开始做准备的人

玩赛车游戏时身体也跟着左右晃动的妈妈

因为某些桥段过于真实，很多cos都能让观众惊呼，这演的简直是我本人：

为了避免出门时跟邻居碰上，趴在门口听到邻居出门之后再出门的人

车站里突然要改东西的社畜

和朋友聊天时，在手机上敲出“哈哈哈哈哈哈我要笑没了”的人

零氪抽出稀有装备之后，全身上下只有一件装备很cool，其他部位都是初始装扮的人

出门旅行拍照，不小心打开前置摄像头的人

在超市上扶梯时，眼睛往下瞅着一楼中庭促销活动的人

以为自己进超市会买很多东西，拿了个篮子之后发现买东西意外很少的人

很多cos也有“理解门槛”，一旦呼应上了cos者的脑洞，好笑程度当场指数上升：

《超级变变变》中，自己组的节目获奖之后，激动到哭出来的扮演黑色背景的人

（节目中的黑色背景人）

婚礼拍照现场帮忙掀起裙子，后期会被P掉的工作人员

量子速读法的指导者

第一次参加线下面基的死宅高中生

甚至有时候，连猫猫也会被拉来“凑数”，为人类的脑洞付出了太多：

动画片头曲中的角色展示环节

嘴上说着“再睡五分钟就起”的人

在家远程办公，完全提不起干劲的人

一些cos留下了点时代印记，眼镜和口罩的不解之缘，永远是纠缠不清的痛。

走在公共场所被仪器测温的人

摘口罩时把眼镜也给弄下来的人

也有一些过于抽象的cos，回味之后感觉无意间打开了新世界的大门。

商品包装上的“肌肉米菲兔”

坐标轴的Y轴

布丁狗的屁股

一路看下来感觉，生活中的各种场景都被演活了...

中国的熊猫管理员

坐了一晚上长途夜班巴士，到站后下车的人

公司要搞万圣节团建，随便拿个小道具糊弄一下的人

事情闹大之后，亲自出面解释情况的博主

看起来莫名其妙又让人意想不到的这场活动，到今年已经是第十次举办。

早在2014年，就有网友自发组织了一次“接地气万圣节cos”聚会，规模很小，到场人数也仅有几十。

但是在网络上渐渐发酵之后，知道这场沙雕活动的人越来越多，第二年160人、第三年300人...到了2019年，已经是颇有规模的活动。

这么多年下来，接地气cos的原则已经深入人心。每年到了万圣节，X（推特）上就会掀起一股网友自发的cos狂欢，稀奇古怪的脑洞配上一些微妙的日式幽默，给网友带来一些万圣节专属震撼。

再回顾往年的经典cos，已经开始期待未来还会出现哪些脑洞：

使用了变脸APP后，APP把自己的脸和星巴克LOGO做了交换的人

穿着黑衣服撸完猫的人

扶梯把手清洁工和她的毛巾

住酒店时忘带钥匙被锁在了房间外的人

化验时刚抽完血，暂时啥都做不了的人

拍证件照时只顾上半身的人

牙医说先含着漱口水等一会儿，于是一直在旁边等着的人

把路边的塑料袋看成猫猫的近视眼

听到警察在隔壁调查，偷偷探出头来查看情况的人

躺着玩手机时被手机掉下来砸到的人

坐在椅子上伸手去够桌下插排的人

能把生活瞬间cos出来的精髓，确实是让大伙儿给整明白了~繁忙的日常生活里能有这样一个“发疯”玩耍的机会，真的很有趣！你对哪一个cos印象最深刻呢？

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公琼软3533cosx - cosy=4/1,sinx - siny=3/1求cos(x - y) -
劳试盆18729807667 ______[答案] cosx-cosy=1/4 cos²x-2cosxcosy+cos²y=1/16 sinx-siny=1/3 sin²x-2sinxsiny+sin²y=1/9 两式相加 2-2cosxcosy-2sinxsiny=1/16+1/9 2-2cos(x-y)=25/144 2cos(x-y)=(288-25)/144 cos(x-y)=263/288

公琼软3533若实数x和y满足|cosx - cosy|=|cosx|+|cosy|,且cosx≠0,y∈(2/3,2π),化简|co -
劳试盆18729807667 ______[答案] 由|cosx-cosy|=|cosx|+|cosy|得cosxcosy≤0,cosy>0,得cosx≤0,故cosx-cosy<0

公琼软3533三角函数题cosx+cosy=cosxcosy……cosx+cosy=cosxcosy,cos((x+y)/2)=0.8,则cos((x - y)/2)=? -
劳试盆18729807667 ______[答案] 这道题还是换元做看着方便些.换元后就用不着积化和差了. a=(x+y)/2,b=(x-y)/2 则x=a+b,y=a-b.条件变成cosa=0.8 ^n表示n次方: cos(a+b)+cos(a-b)=cos(a+b)cos(a-b) cosa cosb - sina sinb + cosa cosb + sinasinb =(cosa cosb - sina sinb)(cosa cosb + ...

公琼软3533用cos(x - y)=cosxcosy+sinxsiny推导tan(x+y), -
劳试盆18729807667 ______[答案] cos(x+y)=cos[x-(-y)]=cosxcos(-y)+sinxsin(-y)=cosxcosy-sinxsiny sin(x+y)=cos[(π/2 - x)-y]=cos(π/2 - x)cosy+sin(π/2 - x)siny=sinxcosy+cosxsiny tan(x+y)=sin(x+y)/cos(x+y)=(tanx+tany)/(1-tanx*tany)

公琼软3533若COSX除以SIN(π/4)等于 - √2/2则COSZ+SINZ等于多少? -
劳试盆18729807667 ______ 等于-2. cosX/sin(π/4)等于-√2/2 sin(π/4)已知等于√2/2 解得cosX=-1 X属于未知数 Z也是未知数 互相代替 -1加-1 就等于-2

公琼软3533三角函数公式的问题cosx2 - cosx1= - [2sin(x1+x2)/2]*[sin(x2 - x1)/2]这个是怎么化出来啊? -
劳试盆18729807667 ______[答案] 把x2=a,x1=b吧,这样好看点.也就是cosa-cosb=-[2sin(a+b)/2]*[sin(a-b)/2]我们知道cos(x+y)=cosxcosy-sinxsinycos(x-y)=cosxcosy+sinxsiny把两式相减得cos(x+y)-cos(x-y)=cosxcosy-sinxsiny-cosxcosy-sinxsiny=-2sinx...

公琼软3533数学求助 根据sin(x+y)=(sinx*cosy+cosx*siny)和siny=sqrt(1 -
劳试盆18729807667 ______ cosx等于12/13,secy就是1/siny,siny等于3/5,cosy等于4/5,带进去就是56/65

公琼软3533关于cosx - cosy等于…这公式的推导这种怎么推导?不推导记不住> -
劳试盆18729807667 ______[答案] 和差化积吗? 因为cos(α+β)=cosαcosβ-sinαsinβ cos(α-β)=cosαcosβ+sinαsinβ 所以cos(α-β)-cos(α+β)=2sinαsinβ 所以cosx-cosy=2sin[(x+y)/2]sin[(y-x)/2]

公琼软3533设z=sinx+F(siny - sinx),其中F为可微函数,求证:(偏z/偏x)cosy+(偏z/偏y)cosx=cosxcosy答案是其次的,主要是过程, -
劳试盆18729807667 ______[答案] dz/dx=cosx+(dF(siny-sinx)/dx)*(-cosx) dz/dy=(dF(siny-sinx)/dy)*(cosy) (dz/dx)cosy+(dz/dy)cosx=[cosx+(dF(siny-sinx)/dx)*(-cosx)]cosy+(dF(siny-sinx)/dy)*(cosy)cosx =cosxcosy-(dF(siny-sinx)/dx)*(cosxcosy)+(dF(siny-sinx)/dx)*(cosxcosy) =cosxcosy

公琼软3533证明不等式cosx - cosy的绝对值小于等于x - y的绝对值提示用拉格朗日中值定理证明 -
劳试盆18729807667 ______[答案] cosx-cosy=-sinε(x-y),ε位于x,y之间 由于-sinε的绝对值一定小于1, 所以cosx-cosy的绝对值一定小于x-y