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★★★★一个初二数学三角函数题★★★★求过程!急如图,在所示的直角坐标系中,P是第一象限的点,其坐标是(3,y)且OP与x轴的正半轴的夹角a的正切是 4/3 ,求1.y的值2.角a的正弦值图: 一道三角函数选择题已知sinx+cosx=-1,则sin^2009 x+cos^2011 x的值为（ ）A.0 B.√3 C.2√3 D.1/2不好意思，打串行了，将选项更正为：A.0 B.1 C.-1 D.±1 一道高一英语选择he suggested( )to twon the next day to buy some food and clothesgo,为什么不能用we went 和 us to go? 高一英语选择一道when she woke up,she realized that things she had dreamed of could not ＿＿＿ have happenedA．possilbyB．likelyC.hardlyD.usually the popular musician was asked__she should intended to be her partner in the next concertA.what B.whom C.how D.when 求极限limx→1(m/1-x^m-n/1-x^n) limx→∞（√x+1-√x）求极限啊 求极限limX→∞（1/X+1）的极限?.最好符上过程. 求limx→1 e^（x/x-1）的左右极限 求极限limx→1,x^4-1/x^3-1 多项式4x²＋1－2x加上一个单项式后,使它成为一个完全平方式,那么加上的单项式可以是（ ）. 多项式axy^2-1/2x与1/4x-bxy^2的差是一个单项式,则a、b的关系是_____________?为什么呢 高一英语一道选择It _____that you didn't go to the cinema.The film was so boring.A)is just as well B)might be as well C)had better D)is as well as 高一英语选择1~4 高一英语1~6,选择 limx→0x² sin1/x 计算极限 limx sin1/x在不同极限时,值分别为多少limx sin1/x在x→0时＝? limx-0x*sin1/x函数的极限 在多项式4x²+1,添加一个单项式,使其成为一个完全平方式,则添加的单项式为? 在多项式4x²+1中,添加一个单项式,使其成为一个完全平方式,则添加的单项式是——（只写一个1.在多项式4x²+1中,添加一个单项式,使其成为一个完全平方式,则添加的单项式是——（只写 i( )a letter today,but o far i ( ) it答案是have been writing;haven't finished,是因为so far用have吗?为什么前面的不能用have wirtten? 英语 句型转换I like skirts 对划线部分提问 划线部分是 skirts连词成句 right,mother,sweater,just,my,is,the,for 句型转换（对划线部分提问）谢谢老师 如果直线y=ax+2008与直线y=bx+2009的交点在x轴上,则a/b的值是___算了改成填空题吧… 最好说原因. 初一几道英语改一般疑问句和划线提问1.I have a tinnis rackey.划线部分为（a tinnis rackey)2.They like hamburger.划线部分为（hamburger） 英语改一般疑问句,对划线部分提问,做出肯定和否定回答1：l am cleaning the room 画线部分：cleaning the room2：the boy is swimming at the pool 画线部分：at the pool 3：his mother is making dinner 画线部分：dinner4 已知数列{an}a1=1 n>=2 Sn^2=an(Sn-1/2)证明是{1/Sn}等差数列麻烦大家 英语句型转换,就划线部分提问I live with my family________________do you ___ ____ 对英语划线部分提问.(句型转换)It takes him an hour to do his homework every day (对划线部分提问) ￣￣￣￣ 特注：划线部分为 an hour 句型转换：___ ___ ___ it take him to do his homework every day 句型转换 对划线部分提问I really enjoyed _walking around the town_ .____ ____ you really _____ _____ They arrived in Penang this morning ____ ____ they ____ in Pengang 按要求转换句型（就划线部分提问Five other cars were just behind him.对“ just behind him”画线 甲.乙两数和是305.8,乙数的小数点向右移动一位后就等于甲数,甲数乙数各是多少?