阳光作业本二年级下

已知a是第三象限角,则sina/2cosa/2的值. 为正.为负? 若sina-2cosa=0,则2sinacosa-5cos²a+2sin2a²-2sinacosa-5cos²a+2=？ sina=2sina/2cosa/2 这是什么公式啊? 举例说明我们了解的世界遗产的必要性.最好是埃及金字塔或巴黎圣母院.快,急死了急死了 举例说明了解外国世界遗产的重要性 说明我们了解外国的世界文化遗产的必要性 用be supposed to 和 be not supposed to 造句,不用太复杂,两句不同就好.、 英语翻译暖春之旅的英文怎么翻译啊急 Don't forget you once owned of things.Let those lost find back Some people, some things, not to say forget to completely forget. Many people, many things, perhaps say goodbye never see. The thing that we want to get is always the best for us.It's the best forever what you cannot get .. it is always the best thing to be alive这句子没错吧有助于回答者给出准确的答案 Don't forget the things u once u owned.Treasure the things u can't get.Don't give up the things t Don't forget the things you once you owned.keep those lost things in memory.Don't give up the things that belong to you and treasure the things you can't get. 《黄生借书说》的 中心是什么? (1/2)sinA=2-2cosA 怎么求sinA Although he is considered a great writer,_____.A.his works is not widely read B.but his works are not widely readC.however his works are not widely read D.yet his works are not widely rea为什么选D 不选A He is a great writer.He has a beautiful m____ ( ) is known to the world , MARKTWAIN is a great American writerA.ThatB.WhichC.AsD.It选哪个?为什么? 《黄生借书说》中“说”的意思 GC-112A气相色谱进样不平行前几天还是平的,什么条件都没变,就是不平行. 疟疾是由()引起的疾病(单选) A.细菌 B.疟原虫 C.病毒 D.支原体 疟原虫 到底是什么 是属于病毒 还是 动物 是不是疟疾的传播途径那疟原虫 在疟疾传播中是干什么的 支原体是病毒还是细菌,怎么治疗? 疟原虫属于细菌,真菌,还是病毒? YOU AND KEEP THOSE LOST THINGS中文是什么意思 谁有形容荷花的词如 亭亭玉立.如果我觉得适合,不是诗词，要形容荷花的姿态 体温计的原理是什么啊? 函数y=sin2xcos2x的最小正周期是 英语翻译Even when the thunder and storm begins I'll be standing stong like a tree in the wind Nothing is gonna move this mountain or change my direction I'm falling off the sky and I'm all alone The courage that's inside is gonna break my fall No 锅炉给水泵价格怎么样? All that glitters is not gold.这句谚语中glitters后面为什么是is,而不是are?难道glitters不是复数吗?