f x xcosx sinx^2+2co2x等于多少

& Cubic graphs and graphs of circles - HigherPage: NextGraphs of sinx°, cosx° and tanx°Here are the sketch graphs of the trigonometric functions f(x) = sinx°, f(x) = cosx° and f(x) = tanx°.You may be asked to draw or sketch these graphs in your exam. Try
to remember what they look like, and follow these tips:If you are asked to draw or plot the graph, you will need to use your calculator to generate
the y values. If you are asked to plot the graph of
f(x) = sinx° for 0°
360°, use your calculator to
find sin0°, sin10°, sin20°, ...., sin360°, and then plot these values on the graph paper.Plotting a trigonometric graph is time-consuming, so it is more likely that you
will be asked to sketch the graph. However, even if you think
you remember what the graph looks like, you can use your calculator to check.
For example, sin0° = 0 and cos0° = 1, so you have
the starting points of the graphs.
Tan90° has no value (your
calculator will display an error message), so you know that the
graph cannot cross the line x = 90°.
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Page: NextActivitySee if you can do it better than Einstein!LinksMake sure your maths skills add up.On bbc.co.ukOn the web
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This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.数学题1.∫1/x√1-ln^2xdx 2._百度作业帮
拍照搜题,秒出答案
数学题1.∫1/x√1-ln^2xdx 2.
7.∫sin^2xcosxdx
8.∫sin^2xcos^2xdx
9.∫xcosx^2dx
10.∫(arctanx)^2/1+x^2dx 11.∫1/1+xe^x dx
12∫3x-2/x^2-2x-15dx
13.cosx/√sinxdx
第一题:∫{1/[x√(1-ln^2x)]}dx=∫[1/√(1-ln^2x)]d(lnx)=arcsin(lnx)+C第二题:∫cos3xdx=(1/3)∫cos3xd(3x)=(1/3)sin3x+C第三题:∫(e^x)sin(e^x)dx=∫sin(e^x)d(e^x)=-cos(e^x)+C第四题:∫{1/[√xtan(√x+1)]}dx=∫{1/[√xtan(√x+1)]}d(√x)^2=2∫[1/tan(√x+1)]d(√x)=2∫[cos(√x+1)/sin(√x+1)]d(√x+1)=2∫[1/sin(√x+1)]d[sin(√x+1)]=2ln|[sin(√x+1)]|+C第五题:∫(1-2x)^6dx=(1/2)∫(2x-1)^6d(2x-1)=(1/14)(2x-1)^7+C第六题:∫(ax+b)^100=(1/a)∫(ax+b)^100d(ax+b)=[1/(101a)](ax+b)^101+C
7. =(sinx)^3/3+C8. =-sin4x/32+x/8+C9.=xsin2x/4+cos2x/8+x^2/4+C10.=(arctanx)^3/3+C11.=12.=11*ln|x+3|/8+13*ln|x-5|/8+C13.=2√sinx+C您所在位置: &
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《高等数学》练习题库
计算数学教研室
一.选择题
C 单调函数
D 无界函数
cosx+1,则f x 为()
3.下列数列为单调递增数列的有()
A.0.9 ,0.99,0.999,0.9999
4.数列有界是数列收敛的()
B. 必要条件
C.充要条件
D 既非充分也非必要
5.下列命题正确的是()
A.发散数列必无界
B.两无界数列之和必无界
C.两发散数列之和必发散
D.两收敛数列之和必收敛
6.设, k为常数 则()
A. f x 在点x有定义
在点x无定义
在点x的某去心邻域内有界
D. f x -k x- C
7.在x处函数f x 的左右极限存在且相等即f x-0
f x+0 是x x时f x 有极限的()
A.必要条件
B.充分条件
C.充分必要条件
D.无关条件
8.下列说法正确的是()
A.无穷小是一个很小的数
B. 无穷大是一个很大的数
C.无穷大是无界的量
D.无界的量是无穷大量
9.函数 在区间上是(
A 单调增加
C先单调增加再单调减少
D先单调减少再单调增加
10.设,则K 为()
13.当x1时,下列与无穷小(x-1)d等价的无穷小是()
14.f x 在点x x0处有定义是f x 在x x0处连续的()
A.必要条件
正在加载中,请稍后...高数sin²xcosx的无穷级数展开式是什么啊?_百度知道
高数sin²xcosx的无穷级数展开式是什么啊?
提问者采纳
先把sin²xcosx化简 稍等啊。
sin²xcosx=(sin2xsinx)/2=-(cos3x-cosx)/4=(cosx-cos3x)/4 再将cosx和cos3x分别展开。
为什么化简sinxcosx,题目是sin²xcosx啊
手机上看不到我打的平方符号
sin^xcosx=(sin2xsinx)/2=-(cos3x-cosx)/4=(cosx-cos3x)/4
为什么你提问的时候,可以打平方符号,我回答的时候,用一样的符号,你看不见呢。
cosx和cos3x怎么化出来的啊?
积化和差公式 sinαsinβ= - [cos(α+β)-cos(α-β)]/2
哦哦谢谢了
不客气,谢谢采纳
其他类似问题
xcosx的相关知识
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出门在外也不愁Derivative Trig Functions
Math2.org Math Tables: Derivatives of Trig Functions
sin(x) = cos(x)
cos(x) = -sin(x)
tan(x) = sec2(x)
csc(x) = -csc(x) cot(x)
sec(x) = sec(x) tan(x)
cot(x) = -csc2(x)
cos(x) = sin(x + PI/2)
PI/2) (Set u = x + PI/2)
= cos(u) * 1 = cos(x + PI/2) = -sin(x) & & & Q.E.D.
tan(x) = sin(x) / cos(x)
sin(x)/cos(x)
= ( cos(x)
sin(x) - sin(x)
cos(x) ) / cos2(x)
= ( cos(x)cos(x) + sin(x)sin(x) ) / cos2(x)
= 1 + tan2(x) = sec2(x) & & & Q.E.D.
= ( sin(x)
) / sin2(x) = -cos(x) / sin2(x) = -csc(x)cot(x)
= ( cos(x)
) / cos2(x) = sin(x) / cos2(x) = sec(x)tan(x)
= ( tan(x)
) / tan2(x) = -sec2(x) / tan2(x) = -csc2(x) & & & Q.E.D.}

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