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三角函数的相关概念问题已知α∈[0,2π),命题P：点P(sinα-cosα,tanα)在第一象限.命题q:α∈[π/2,π].则命题P是命题┒q的( )(A)充分不必要条件 (B)必要不充分条件(C)充要条件 we should remember to help_____people.填other对吗,不对的话应该填什么 几道三角函数送分概念问题!如下题：1：若α、β∈（0,π/2） 且sinα - cosβ＜0,则（ ）A：α＞β B：α＜β C：α+β＜0 D：α+β＞0 请尽可能详细一点!2:9-x²≥0 的解集不是x≤±3吗?怎么会是-3≤x≤ don't talk loudly on a bus.we should r---- other people 首字母填空 三峡一文中与答谢中书书"高峰入云,清流见底"有异曲同工之妙的句子是? 答谢中书书 试以高峰入云,清流见底为例说说该句是如何体现此特点的? 山川之美,古来共谈.高峰入云,清流见底……这个扩写怎么扩啊,哥哥姐姐帮帮忙吧 一首英语歌曲中有一句歌词好像是“love can only happan when it's raining ”请问这是谁唱的什么歌可能歌词记得不太准确,但是大概是这样,希望大家给我一个答复.thanks是女的唱的 用所给动词的适当形式填空 Lucy,why not______(go) to the cinema with us this afternoon.说下为什么 when something go down.I saw do everything is not so easy! Everything is easy to do（用义句转换） ________ ________different to do 15.---Could you tell me __________?---Quite well,thank you .A.what do you do B.are you good at maths C.what you think of the film D.how you are getting on with classmates答案是D看,答句不是重点.C选项在语法方面方面的错误是哪里 take me to your hear 的中文最好是1句对1句的 Did you hear the song TAKE ME TO YOUR HEART如何改现在完成时 ARTS AND IDEAS怎么样 Press the armhole seam allowance toward the sleeve 翻译 the sleeve effect piece should continue over back sleeve piece until sleeve under seam the seam 化妆品怎么样 the mit slogan school of management and the school of science overlock without safety是什么意思,还有coverstitch,topstitch,interlock和overlock? with overlock edges and 15 cm hemmed seam impossible是什么意思 （1）在等比数列an中,a3=2,a2+a4=20/3,求数列an的通项公式（2）在等比数列中an的前n项和为sn,已知a1+an=66,a4an-3=128,sn=126,求n和公比q的值 sealed seam 服装上的,客户要求sealed seam.Seam-sealing is the process of completely sealing a seam on a garment against wind and rain.Seam-sealing a fleece garment is very hard as you need to bring the two fleece faces of fabric together,stitc french 已知数列An中,A1=1,AnAn+1=(1/2)^n,1)求证{an}为等比数列 已知数列an中,a1=1,a2=2,数列｛anan+1｝是公比为q(q>0)的等比数列1.若(anan+1)+(an+1an+2)>an+2an+3,求q的取值范围2.求数列an的前2n项和S2n future with will是什么意思 I will be there with you in the future是什么意思郁闷，好像我想问的是I will be with you in the future we will check it out later,and anyway what matters most is who I am going to see it with ,not thewe will check it out later,and anyway what matters most is who I am going to see it with ,not the show 翻译 八年级上册英语be going to语法练习求高手!Be going to 练习题（）3.He will____Beijing tomorrow morning,if the train isn’t late.A.reached B.get C.arrive at D.arrive in（）4.Michael Jordan is good at _____basketball.A.to play B.play 关于借景抒情的作文的开头结尾