24小时热门版块排行榜

返回列表

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

追风的风

新虫 (小有名气)

应助: 1 (幼儿园)
金币: 122.1
散金: 5
帖子: 112
在线: 70.9小时
虫号: 3576099
注册: 2014-12-04
性别: GG
专业: 机构学与机器人

[求助] 小女子公式求助，各位大神帮帮啦！已有3人参与

我有一个公式，需要求出x，s=2R*sin（x/2）+p*tan(x/2),各位大神这个该怎么求，谢啦！（s，R，p当做已知）

回复此楼

» 猜你喜欢

同年申请2项不同项目，第1个项目里不写第2个项目的信息，可以吗已经有8人回复
依托企业入选了国家启明计划青年人才。有无高校可以引进的。已经有7人回复
依托企业入选了国家启明计划青年人才。有无高校可以引进的。已经有10人回复
天津大学招2026.09的博士生，欢迎大家推荐交流（博导是本人）已经有9人回复
有院领导为了换新车，用横向课题经费买了俩车已经有10人回复
AI 太可怕了，写基金时，提出想法，直接生成的文字比自己想得深远，还有科学性已经有6人回复
酰胺脱乙酰基已经有13人回复
有时候真觉得大城市人没有县城人甚至个体户幸福已经有10人回复

哈哈

1楼 2016-01-21 09:57:08

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

w-chin

木虫 (正式写手)

应助: 1 (幼儿园)
金币: 4521.7
散金: 894
红花: 5
帖子: 467
在线: 836.3小时
虫号: 858053
注册: 2009-09-27
性别: GG
专业: 电化学

结果文件这里，没法直接copy出来。话说为什么要解析解？http://pan.baidu.com/s/1i4zY14h

赞一下

回复此楼

井蛙不可以语于海者，拘于虚也；夏虫不可以语于冰者，笃于时也；曲士不可以语于道者，束于教也。

7楼2016-01-24 12:50:17

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

查看全部 10 个回答

wurongjun

专家顾问 (职业作家)

专家经验: +831
数学EPI: 9
应助: 791 (博后)
贵宾: 0.308
金币: 24609
散金: 310
红花: 75
帖子: 3004
在线: 881.2小时
虫号: 1368482
注册: 2011-08-14
性别: GG
专业: 计算数学与科学工程计算
管辖: 数学

【答案】应助回帖

★ ★
感谢参与，应助指数 +1
追风的风(Edstrayer代发): 金币+2 2016-01-24 03:37:32

Matlab 的solve命令!
例如!
>> solve('2*sin(x/2)+3*tan(x/2)=2','x')

ans =

[    2*atan((2/3*(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^3+(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^2-1)/(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2)))]
[ 2*atan((2/3*(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^3+(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^2-1)/(-3/4+1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*((6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)-9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2)))-2*pi]
[ 2*atan(2/3*(-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^3+(-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^2-1,-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))]
[ 2*atan(2/3*(-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^3+(-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))^2-1,-3/4-1/4*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)-1/4*i*((-6*(315+72*19^(1/2))^(1/3)*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)*(315+72*19^(1/2))^(2/3)+9*(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2)+48*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3)/(((315+72*19^(1/2))^(2/3)+9+3*(315+72*19^(1/2))^(1/3))/(315+72*19^(1/2))^(1/3))^(1/2))^(1/2))]

>> double(ans)

ans =

0.7824
  -4.5525
5.0266 - 2.6622i
5.0266 + 2.6622i

赞一下(4人)

回复此楼

善恶到头终有报,人间正道是沧桑.

2楼2016-01-21 10:20:33

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖