y=sin{1 2x pai 3}单调增区间
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sin(2x+π/3)∈(-1,1)sin(2x+π/3)+2∈(1,3)∴函数y=log3的定义域为R值域为单调性:单调递增,单调递减周期性:π最值:最大值:1,最小值:0
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
y=sin(sinx)y‘=cos(sinx)*(sinx)'=cos(sinx)*cosx
y=lg[sin(2x+π/2)]=lg[cos2x)]则只要确定cos2x的增且正的区间即可,利用余弦函数图像,得增区间是:(kπ-π/4,kπ],其中k是整数.
设u=1-2sin(2X+π/3),U>0,这就是罪(2X+π/3)]再问:麻烦不要复制好么==
y=sin²x+sin2x+2cos²x=sin2x+(1+cos2x)/2+1=sin2x+1/2*cos2x+3/2=√5/2(2/√5*sin2x+1/√5*cos2x)+3
左边=(sinxcosy+cosxsiny)(sinxcosy-cosxsiny)=sin²xcos²y-cos²xsin²y=sin²x(1-sin
y=sinx在(2kπ-π/2,2kπ+π/2)为增,在(2kπ+π/2,2kπ+3π/2)为减函数y=cosx在(2kπ-π,2kπ)为增,在(2kπ,2kπ+π)为减函数y=tanx在(kπ-π/
(1)横坐标伸长到原来的3倍则函数变为y=sin(2x+π/4)(x系数变为原来的1/3)(2)向右平移π/8个单位则函数变为y=sin[2(x-π/8)+π/4]=sin2x
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)
y=|sin^22x|=|(1-2sin^22x)/2-1/2|=|(cos^22x-sin^22x)/2-0.5|=|0.5cos4x-0.5|最小正周期是pie/2|sin^22(-x)|=|0.
[注]:pi表示圆周率兀√表示根号x^2表示x的平方(1)使用辅助角公式:|cos2x-sin2x|=√2|cos(2x+pi/4)|由x∈R可知:√2|cos(2x+pi/4)|∈[0,√2]所以M
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)因为x∈(-π/2,π/2),则x+π/4∈(-π/4,3π/4)所以由正弦函数的单调性可知:函数y=sin(x+π/4),x∈(-π/2,π/2)的值域是(-√2/2,1](2)函数y=1/2
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)/
[-k¥-¥5/8,-k¥-¥/8]
利用相关法因为sinx在[2kpi-pi/2,2kpi+pi/2]上递增,在[2kpi+pi/2,2kpi+3pi/2]上递减所以让(2x+pi/2)属于[2kpi-pi/2,2kpi+pi/2],也
周期为2pai/2=pai最值为3单调性为(-1/3pai,1/6pai)递增(1/6pai,2/3pai)递减
y=sin(-3x)=-sin3x单调递增区间是2kPai+Pai/2
噢,数学第一册书下就有啊!y=sin和y=cos定义域为R,值域为-1到1.y=sinx为奇函数,y=cosx为偶函数.周期为2π.y=tanx定义域为x不等于π/2+kπ,值域为R,周期为π,为奇函