cos2x的导数等于多少

德语在京的语伴我想要找一个德语语伴,但是要求是德国人还得会说英文,麻烦各位能不能提供一些好的又比较可靠的途径~ 请问警惕和谨慎有什么区别? 一个体重100千克的人过一段时间的锻炼后,.一个100千克的人经过一段时间的锻炼后,体重降下的五分之一,由于没有继续坚持锻炼,体重有长了五分之一,此人现在体重多少千克? 投资需谨慎 投资须谨慎 有什么区别 为什么体重不够45千克的人不宜献血 谨慎和胆小有什么区别? 篮球队员7人,其中3人的体重都在65.2千克,其余4人均重66.6千克.篮球队员的平均体重是多少千克? 秋天算景物吗? please book after my ganden whil Z am away 翻译成中文 My d___ home is very beautiful.it is a two-floor b___.in my family,everyone has his or her o___ room.The rooms are big and on the first floor.on the ground floor,there is a big s___ room and a dining room.at the weekend,my friends and l like having a 1.The English boy can't speak Chinese and Japanese.哪里错了? 从括号里选出一个词填空His parents____(have,has）many good books.并说明理由, Zhong Qiu Jie in C___is the Mid-autumn Festival .Mid-Autumn Festival usually c___ septenber or October.On that day everyone comes b___home with mooncakes.A mooncake is delicious,round and l___the moon.there re many different kinds of mooncakes w___me 根据要求改写下列各句.1My friend is from England.(改同义句）.My friend ___ ___ England.2Lucy is in the English Club.(改同义句）.Lucy is a ___ ___ the English Club.3They need some apples and beef(改为否定句）.They __ __ __appl 伴随着孩子们那稚嫩的呼喊声响起的纳粹的枪声,对此你有何感想 与朱元思书 这个课文写成现代文 要求加一点想象同上 Did you teacher think you _ a good student?(be)说明理由啊! 英菲尼迪为什么那么贵 四年级的黑板报,内容自定,但是要：“开学啦”为题目的作文,请给我一片作文,还有一些图,给你大大奖赏! 翻译下列词语： 1.可以 翻译每空一词 用英语怎么说,一名新同学帮助了我 请你发挥想象力,描写匈奴人听到班超进攻后的心理活动 黄麻麻布的生产加工流程是什么 古代麻布是什么原料制成的? 抻不开 石岩麻布新村的邮政编码是什么么 作者几次去‘鸟的天堂’看到的景象一样吗?为什么 Error 200:Division by zero division by 请进快回复. After the party,__they picked up the rubbish on the floor.A.that has been droppedB.which had been droppen C.that had been fallen.选什么为什么 Division by zero