sinx+cosx-1/sin3x-x2(平方)求极限x趋向0
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sinx+cosx-1/sin3x-x2(平方)求极限x趋向0sinx+cosx-1/sin3x-x2(平方)求极限x趋向0sinx+cosx-1/sin3x-x2(平方)求极限x趋向0(x→0)li
sinx+cosx-1/sin3x-x2(平方)求极限x趋向0
sinx+cosx-1/sin3x-x2(平方)求极限x趋向0
sinx+cosx-1/sin3x-x2(平方)求极限x趋向0
(x→0) lim (sinx+cosx-1)/(sin3x-x^2)
= (x→0) lim [sinx - 2 sin^2(x/2)] / (sin3x-x^2)
= (x→0) lim [(sinx)/x- sin^2(0.5x)/(0.5x)] / [3(sin3x)/3x - x] 上下同除以 x,利用重要极限(sinx)/x
= (x→0) lim [1-sin(0.5x)] / (3*1-x)
=1/3
sin3x/sinx+cos3x/cosx
sinx+cosx-1/sin3x-x2(平方)求极限x趋向0
(sin3x+sinx)/(cos3x+cosx)=
sin3x/sinx-cos3x/cosx化简
求证sinx+sin3x+sin2x=1+cos2x+cosx
解方程;SinX+Sin2X+Sin3X = 1+CosX+Cos2X.
sin3x-cos3x-sinx+cosx怎么解?
化简:(cos3x,sin3x)·(cosx,sinx)和│(cos3x,sin3x)+(cosx,sinx)│要有过程.
由此证明sinx-sin3x+sin5x=sin6x/2cosx,cosx≠0cosx+cos3x+cos5x +...+ cos(2n-1)x= sin2nx/2sinx由此证明sinx - sin3x + sin5x = sin6x/2cosx ,cosx≠0
lim(tan5x-cosx+1)/sin3x
已知sinx -cosx =1/ 5求sin3x-cos3x的值急.
sin3x+cos3x=(sinx+cosx)(1-sinxcosx) 求中间化简过程
已知cosx/cos3x=3 ,求sinx/sin3x
sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)化简
sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)化简
证明:sin3x(sinx)^3+cos3x(cosx)^3=(cos2x)^3
用sinx,表示sin3x,用cosx表示cos3x
cos3x/2×cosx/2-sin3x/2×sinx/2