y=sin(x0 △X)-sinx0=2sin△x 2cos(x0 △ 2)
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 02:15:35
和差化积公式.如果不清楚,请去翻翻书.
y=Asin(ωx+ψ)周期为:T=2π/ωy=sin(x+1),ω=1,所以T=2π
x=0:0.01:1;y=0;fori=1:20y=y+sin(i*x);endplot(y);
sin(x+y)sin(x-y)=-1/2(cos(x+y+x-y)—cos(x+y-x+y))=-1/2(cos2x—cos2y)=-1/2(1-2(sinx)^2-1+2(siny)^2)=(si
1.确定定义域{x|x∈R}2.判断奇偶性y(-x)=y(x)偶函数3.画图像画出x>0部分图像,将x>0部分图像向左翻折再问:那如果x属于-2π到2派间应怎样取值(5点法)再答:从右面开始画x-3π
y=sin^3x是复合函数可以设t=sinxt'=cosxy=t^3y'=3t^2*t'y'=3sin^2x*cosx
∵y=x^(sinx)∴lny=sinx*lnx两边求导:y'/y=cosx*lnx+(sinx)/x∴y'=y[cosx*lnx+(sinx)/x]=x^(sinx)[cosx*lnx+(sinx)
f(x)=2sinx*sin(π/2+x)-2sin^2x+1=2sinxcosx+cos2x=sin2x+cos2x=√2sin(2x+π/4)因为f(x0/2)=根2/3所以sin(x0+π/4)
左边=(sinxcosy+cosxsiny)(sinxcosy-cosxsiny)=sin²xcos²y-cos²xsin²y=sin²x(1-sin
多么庞大,在牧场!在我们之间乌鸫飞翔后代的眼睛这么快就开始我将利用水.今天空气中什么都没有不是他们你得起的誓言哈哈
dy/dx相当于对x进行求导:dy/dx=y'=2x*cos[sin(x^2)]*cos(x^2)由于:sinx=cosx,sin(x^2)=2x*cos(x^2)
dx/dt={1/[2√(1-t^2)]}(-2t)=-t/√(1-t^2)dy/dt=1/√(1-t^2)dy/dx=[1/√(1-t^2)]/[-t/√(1-t^2)]=-1/t再问:为啥dy/d
y'sin(y/x)-y/x*sin(y/x)+1=0令y/x=u,则y'=u+xu'所以(u+xu')sinu-usinu+1=0xu'sinu+1=0-sinudu=dx/x两边积分:cosu=l
/>(1)f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)=cos(2x-π/3)+2sin(x-π/4)cos[π/2-(x+π/4)]=cos(2x-π/3)+2sin
(x^x)'=(1+lnx)x^x所以y'=(1+lnx)x^xcos(x^x)
sinx+siny+sinz-sin(x+y+z)=4sin[(x+y)/2]sin[(x+z)/2]sin[(y+z)/2]sinx+siny+sinz-sin(x+y+z)=2sin[(x+y)/
-2k=cos2x-cos2y=[2(cosx)^2-1]-[2(cosy)^2-1]=2[(cosx)^2-(cosy)^2]cos^2x-cos^2y=-k
点的坐标表示经过点(x,y)的正切值再答:正弦值再答:刚打错了不好意思再问:一语点醒梦中人,谢谢再答:呵呵
y=sin(-3x)=-sin3xy=cos(3x+π\4)=cos(π/2+3x-π/4)=-sin(3x-π/4)=-sin[3(x-π/12)]所以,要向左平移π/12个单位再问:不是应该左加右