sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)化简
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sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)化简
sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)
化简
sin3x+cosx-cos3x-sinx/2(sin2x+cos2x)化简
sin3x/sinx+cos3x/cosx
(sin3x+sinx)/(cos3x+cosx)=
sin3x/sinx-cos3x/cosx化简
sin3x-cos3x-sinx+cosx怎么解?
f(sinx)=cos3x,那么f(cosx)=?A.sin3x B.cos3x C.-sin3x D.-cos3x
化简:(cos3x,sin3x)·(cosx,sinx)和│(cos3x,sin3x)+(cosx,sinx)│要有过程.
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
sin公式化简y=(sinx+sin3x)/(cosx-cos3x)的化简由于忘的已经太多了.能否详细一些.打算重新把这些东西拾起来.
sinx+sin3x+sin5x+.sin(2n-1)/cosx+cos3x+cos5x+.cos(2n-1)= sin2x+sin4x+.sin 2nx /cos2xsinx+sin3x+sin5x+.sin(2n-1)/cosx+cos3x+cos5x+.cos(2n-1)=sin2x+sin4x+.sin 2nx /cos2x+cos4x+.cos2nx =已知数列an通项公式(n+2)*(9/10)的n次方,求n为何
证明cos3x/sinx+sin3x/cosx=2cot2xcos3x/sinx+sin3x/cosx=2cot2x 证明左等於右边.
已知cos3x=4(cosx)^3-3cosx,用微分法求sin3x.
sin3x、cos3x等于好多?
y=sin3x+cos3x