作业帮y＝1 2arctan√(1+x^2)
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两边取正切y=tan(x+1)
(arctan(1-x^2))'=1/(1+(1-x²)²)(1-x²)’=(-2x)/(1+(1-x²)²)=-2x/(x^4-2x²+2
y=arctanx/(1+x²)那么y'=1/[1+x²/(1+x²)²]*[x/(1+x²)]'=(1+x²)²/[(1+x&#
y=e^(1/x)的反函数为y=1/(lnx)x>0
∫arctan(1+√x)dx换元t=arctan(1+√x),(tant-1)^2=x=∫td(tant-1)^2=t(tant-1)^2-∫(tant-1)^2dt=t(tant-1)^2-∫(s
先求值域√x≥0所以0≤y＜π/2y=arctan√xtany=√xx=tan²y即y=tan^2(x)（0≤x＜π/2)
y=arctan(1-x)1-x=tany对x求导-1=y'sec²y所以y'=-1/sec²y=-cos²y=-cos²[arctan(1-x)]y'=-co
arctanx'=1/(1+x^2)y=arctan(x+1)^1/2y'=1/(1+(x+1)^1/2^2)*(x+1)^1/2'y'=1/(x+2)*1/2(x+1)^(-1/2)y'=1/[2(
y'=1/[1+(1/x)^2]*(1/x)'=x^2/(1+x^2)*(-1/x^2)=-1/(1+x^2)
差不多,但是有小区别.arctan(x/y)的范围是(-π/2,π/2)而arctan(x,y)的范围是(-π,π]http://www.cplusplus.com/reference/clibrar
dy/dx=1/[1+(1+x^2)]*2x刚考过导数表示非常苦逼.哎我还是讲清楚点这是复合函数,把它拆成y=arctanuu=1+x^2再分别求导数再问：·再答：==dy/dx=[arctan(1+
z'(x)=1/[1+(x^y)]*1/2√(x^y)*yx^(y-1)=yx^(y-1)/{2√(x^y)[1+(x^y)]}z'(y)=1/[1+(x^y)]*1/2√(x^y)*lnx*x^y=
y=4arctanxy'=4/(1+x^2)所以y'(1)=4/(1+1^2)=2
y'=1/[1+(x^2+1)^2]×(x^2+1)'=2x/(x^4+2x^2+2)再问：
须知(e^x)'=e^x,(arctanx)'=1/(1+x²)y=e^arctan(1/x)y'=e^arctan(1/x)·1/[1+(1/x)²]·(-1/x²)=
因为,(tanx)’=1/cos²x,Y^(－1)｛Y的反函数｝=tanx所以y^(－1）=（－2）·√（1-3x）/3·coos²√（1-3x）因为y’=1/[y^(-1)]ˊ所
此题复合求导dy=d[arctan(1-x/1+x)]=[1/(1+(1-x/1+x)^2)]·(1-x/1+x)';注：(arctanx)'=1/(1+x^2)=-(1/(x^2+1))
y=arctanx+1\x-1y'=1/[1+(x+1\x-1)^2]*(x+1\x-1)'=1/[1+(x+1\x-1)^2]*(-2)/(x-1)^2=-1/(1+x^2)
此题是这样的吧：函数y=arctan[(1+x)/(1-x)]?若是这样,y′=1/[1+(1+x)²/(1-x)²][(1-x)+(1+x)]/(1-x)²=2/[(1