x^4 (sin(3x))^2是x的几阶

sinx+cosx=m平方sin²x+cos²x+2sinxcosx=m²1+2sinxcosx=m²sinxcosx=(m²-1)/2所以sin&s

2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1=-(1-2sin^2[(π/4)+x)-√3cos2x=-cos(π/2+2x)-√3cos2x=sin2x-√3cos2x=2[

1.（sin^4x-sin^2x）/secx=sin^2x(sin^2x-1)cosx=-sin^2xcos^2xcosx=-sin^2xcos^3x2.sin^4x-cos^4x=(sin^2x+c

2sin(x-π/4)sin(x+π/4)=cos(x-π/4-x-π/4)-cos(x-π/4+x+π/4)=-cos2xf(x)=cos(2x-π/3)-cos2x=cos(2x-π/6-π/6)

用公式a³+b³=(a+b)(a²-ab+b²)cos^6x+sin^6x=(cos²x)³+(sin²x)³=(cos

f(x)=cos(3x)*cos(2x)+sin(3x)*sin(2x)=cos(3x-2x)=cosxf'(x)=-sinx

1.√3sinx+cosx=2*(sinx*√3/2+cosx/2)=2(sinxcosπ/6+cosxsinπ/6)=2sin(x+π/6)2.用万能公式可得字数受限

x=0:0.1:2*pi;s=2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x);plot(x,s)

f(x)=sin(2x-π/6)=cos[π/2-(2x-π/6)]=cos(2π/3-2x)=cos(2x-2π/3),故f(x)为偶函数,且其关于x=π/3对称,周期为π,因此a的最小整数为π.

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)/

f(x)=sin^2x+2√3sinxcosx+sin(x+π/4)sin(x-π/4)=(1-cos2x)/2+√3sin2x+(1/2)2sin(x-π/4)cos(x-π/4)=2-2cos2x

sin(x-900°)cos(-90°-x)cos(1440°-x)/sin(x-270°)sin(-x-720°)=sin(-180°+x)cos(-90°-x)cos(-x)/sin(-270°+

sin^4x-sin^2xcos^2x+cos^4x=sin^4x+2sin^2xcos^2x+cos^4x-3sin^2xcos^2x=(sin^2x+cos^2x)^2-3sin^2xcos^2x

解sin^2x=1/csc^2x∫csc^2xdx=-cotx+c不懂追问再问：为什么是-cot不是cot呢？再答：cot'=-csc^2x这里是正的

1.已知函数f(x)=cos(2x-π/3)2sin(x-π/4)sin(xπ/4)(1)求函数f(x)的最小正周期和图像的对称轴方程（2）求函数f(x)在区间[-π/12,π/2]上的值域⑴f(x)

1、sinx=2分之根号2,或者cos(4x)=02、sinx=负二分之一,或者cosx=二分之一,或者cosx=0

sin(5/2x)/2sin(x/2)-1/2(0

sin^2(x)+cos^2(x+30)+sin(x)cos(x+30）=sin^2(x)+cos(x+30)[cos(x+30)+sinx]=sin^2(x)+cos(x+30)(cosxcos30

sin^4x-sin^2xcos^2x+cos^4x=sin^4x+2sin^2xcos^2x+cos^4x-3sin^2xcos^2x=(sin^2x+cos^2x)^2-3sin^2xcos^2x