y=3tan{pai 6-x 3}的定义域
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由3x-π3≠kπ+π2,k∈Z,得x≠kπ3+5π18,k∈Z.∴函数y=tan(3x-π3)的定义域为{x|x≠kπ3+5π18,k∈Z}.值域为:(-∞,+∞).由−π2+kπ<3x−π3<π2
第二项应该是3x^2吧,先求导设k=3x^2+6x+6=3(x+1)^2+3当x=-1时斜率最小为3,切点为(-1,-14),所以切线方程为3x-y-11=0
因为是偶函数,所以,sin(y+x)+根号3cos(x-y)=sin(y-x)+根号3cos(-x-y)所以,可以展开:sinycosx+cosysinx+根号3cosxcosy+根号3sinxsin
sin(x+y)=sinxcosy+cosxsiny=1/2sin(x-y)=sinxconsy-cosxsiny=1/3sinxcosy=5/12,cosxsiny=1/12tanx/tany=si
由题意,得斜率=3×1平方=3所以切线方程为y-1=3(x-1)即y=3x-2
tanx函数的周期是π,所以y=tan(2x-3)的周期等于π除以2=π/2
∵函数y=tan(x-π6),∴x-π6≠kπ+π2,k∈z,求得 x≠kπ+2π3,k∈z,故函数的定义域为{x|x≠kπ+2π3,k∈z},故答案为:{x|x≠kπ+2π3,k∈z}.
∵y=tan(2x-π3),∴其周期T=π2.
y'=1/(tan(x/2))*(tan(x/2))'=1/(tan(x/2))*(sec^2(x/2))*(x/2)'=1/(2sin(x/2)*cos(x/2))=1/sin(x)=csc(x)
(x+y)³=x³+y³+3x²y+3xy².记忆方法:各立方,然后3x方y,3xy方(x+y)³=x³-y³-3x
y'=sec²(4-3x)*(4-3x)'=sec²(4-3x)*(-3)=-3sec²(4-3x)*
y=3tan(π6-x4)=-3tan(x4-π6),∴T=π|ω|=4π,∴y=3tan(π6-x4)的周期为4π.由kπ-π2<x4-π6<kπ+π2,得4kπ-4π3<x<4kπ+8π3(k∈Z
周期为pai/2定义域为集合2X-pai/4不等于kpai+pai/2k属于整数单调递增区间为kpai-pai/2
y'=(X^3)'+(xsinx)'=3x^2+(x)'sinx+x(sinx)'=3x^2+sinx+xcosx
x+y=1(x+y)^2=x^2+2xy+y^2=1(x+y)^3=x^3+y^3+3xy(x+y)=1而x^3+y^3=1/3,代入得:3xy=2/3xy=2/9由于x=1-y;故代入xy=2/9;
因为:正切函数y=(tanx)y'=1/(cosx)^2对数函数y=lnxy'=1/x所以:y=lntanx是个复合函数y'=(1/tanx)*(tanx)'=(1/tanx)*[1/(cosx)^2
27.已知x=1.25,y=-0.64时,求[(x+y)3-(x3+y3)]÷(x+y)的值.[(x+y)^33-(x^3+y^3)]÷(x+y)解,得:==(x+y)^3*1/(x+y)-(x+y)
设一个变量u=y/x,带入方程很好求解,解不出来再联系我哈
y=x³-6x²+12x-8-x³=-6x²+12x-8=-6(x-1)²-2所以x=1,y最大=-2
x3+3xy-y3=(x-y)(x^2+y^2+xy)+3xy=-x^2-y^2+2xy=-(x-y)^2=-1