互毒 春芽
共回答了24个问题采纳率：87.5% 举报
1年前
回答问题
证明sin(4A)sin(2A)(1-cos(2A)) cos(4A)cos(2A)(1 cos(2A))=cos(2A
1年前1个回答
sin^2a+sin^2a.cos^2a+cos^2a化简
-如何由2=sin^2a/cos^2a,sin^2a-cos^2a=1这两条式子算出sin^2a和cos^2a
1年前3个回答
(1+sin2a+cos2a)/(1+sin2a-cos2a)+(1+sin2a-cos2a)/(1+sin2a+cos
化简sin^2a+sin^2b-sin^2a*sin^2b+cos^2a*cos^2b
1年前2个回答
证明 sin^2A+sin^2B-sin^2A*sin^2B+cos^2A*cos^2
sin^2a+sin^2b-sin^2a * sin^2b+cos^2a * cos^2b 化简
1年前7个回答
cos^4a/(cos^2b)+sin^4a/(sin^2a)=1 求证cos^4b/(cos^2a)+sin^4a/(
化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β
若sin^4a/sin^2b+cos^4a/cos^2b=1,证明sin^4b/sin^2a+cos^4b/cos^2a
证明cos^2a+2sin^2a+sin^2atan^2a=1/cos^2a
sin/cos^2a+cos/sin^2a最小值
怎么画简sin^2a·sin^2阝+cos^2a·cos^2阝-1/2cos2a.cos2阝
2cos2a-1/1-2sin2a 为什么2cos2a-1=cos2a 1-2sin2a=cos2a
求证：sin^2A+cos^2A+sinAcosA/sin^2A+cos^2A=tan^2A+1+tanA/tan^2A
若tana=2,则【sin^2a-cos^2a】/[2sin^2a+cos^2a]=
求sin∧2a·sin∧2β+cos∧2a·cos∧2β-1/2cos2a·cos2β..
=sin2a/cos2a-sin2acos2a/cos2a 如何得出?=sin2a/cos2a(1-cos2a)
Sin^4a+cos^4a怎么=（sin^2a+cos^2a)-2sin^2acos^2a的.求详解.在线等
cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?
你能帮帮他们吗
一宽为1cm的刻度尺在半径为5cm的圆上移动，当刻度尺的一边与圆相切，另一边与圆有两个交点时，其中一个交点对应的读数恰好
I love sports New.what about you?____,you.A.I did B.I do C.I
when you are old and when your tooth out where isyour soul l
下列几组地形区属于北方地区的是( )
已知AD是Rt三角形ABC的斜边BC上的高,AD=2√3,BD=4,则DC=?
精彩回答
图中剖面可能经过六大板块中的
用夹逼定理求n次根号下(2+ 1/n)的极限 缩小的时候可以把1/n直接删掉,变成n次根号下2吗?
The director is a special man, he likes doing everything _______ (different).
He said that he would d________ all his life to educating children.
Which of the following sentences doesn't have a liaison(连读)?
赞
