若sin^8x cos^8x=41 128,x∈﹙0,pai 2),则x=

f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx=(sin²x+cos²x)²-3sin²xcos²x/2-2s

那个前半括号里面相加等于一

先化简.f(x)=（sin^4x+cos^4x+sin^2xcos^2x）/（2-2sinxcosx）-1/2sinxcosx+1/4cos^2x=【（sin²x+cos²x）&s

cos^4x+sin^2xcos^2x+sin^2x=cos^4x+(1-cos²x)cos²x+sin²x=cos^4x+cos²x-cos^4x+sin&#

sin^4x+cos^4x+sin^2x*cos^2x=sin^4x+cos^4x+2sin^2x*cos^2x-sin^2x*cos^2x=(sin^2x+cos^2x)^2-sin^2x*cos^

y=(sin^2x+cos^2x)^2+2sin^2xcos^2x-1=1+2sin^2xcos^2x-1=2sin^2xcos^2x=sin^2(2x)/2=(1-cos4x)/4周期显然是pi/2

y=sin^4x+cos^4x+4sin^2xcos^2x-1=(sin^2x+cos^2x)^2+2sin^2xcos^2x-1=1+2sin^2xcos^2x-1=2sin^2xcos^2x=si

∵[xcos(x+y)+sin(x+y)]dx+xcos(x+y)dy=0==>xcos(x+y)dx+xcos(x+y)dy+sin(x+y)dx=0==>xcos(x+y)(dx+dy)+sin(

f(x)=sin2ωx+√3cos2ωx=2sin(2ωx+π/3),两对称轴之间的最小值为π/2即半个周期,则周期为π=2π/2ω,所以w=1,所以f(x)=2sin(2x+π/3),f(α)=2s

合并同类项么,很简单的只要你愿意去做左边=cos*x（cos*y+sin*y）+sin*x（cos*y+sin*y)=cos*x+sin*x=1=右边

x^2-6xcosθ-4y+9cos^2θ+8sinθ=0(θ为参数),配方：(x^2-6xcosθ+9cos^2θ)=4y-8sinθ(x-3cosθ)^2=4(y-2sinθ)曲线是一条抛物线,焦

y=sin⁴3xcos³4xdy/dx=cos³4x*d(sin⁴3x)/dx+sin⁴3x*d(cos³4x)/dx=cos

f(x)=[(sin^2x+cos^2x)^2-sin^2xcos^2x]/(2-2sinxcosx)=(1-sinxcosx)(1+sinxcosx)/2(1-sinxcosx)=1/2sinxco

(sinx)^4+(cosx)^4=(sinx)^4+(cosx)^4+2sin²xcos²x-2sin²xcos²x=(sin²x+cos²

t=sinx+cosx=√2sin(x+π/4)-√2=再问：上面那个颠倒的V是什么再答：那是根号呀，√2表示根号2.再问：sin^2x这个颠倒的＾也是根号？再答：这个是次方符号呀，sin^2x表示的

sin(x-y)=sinxcosy-cosxsiny,sin(x+y)=sinxcosy+cosxsinysin(x-y)sin(x+y)=sin²xcos²y-cos²

证明：因为左边=sin²X(sin²X+cos²X)+cos²X=sin²X+cos²X=1=右边,所以：(sinX)^4+sin²

1）f(x)=a(cos^2x+sinxcosx)+b=a/2(1+cos2x+sin2x)+b=a/2根号2sin(2x+π/4)+a/2+b2kπ-π/2=

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

∫sin^2xcos^3xdx=∫sin^2x(1-sin^2x)dsinx=∫sin^2x-sin^4xdx=(1/3)sin^3x-(1/5)sin^5x+C不是让你求助我吗.再问：∫sin^2x