当x∈(0,π/2)时,证明:x/(1+x²)<arctanx<x,
证明当x>0时,arctanx+1/x>π/2
当x>0时,证明:arctanx+1/x>π/2,
证明当x>0,arctanx+arctan1/x=π/2
证明:当x>0时,1/x>arctanx-π/2
证明当x趋近于0时,arctanx~x
证明:当X→0 时,arctanX~X
证明:当x趋向于0时,有:arctanx~x
证明:当x>0,有不等式arctanx+1x
证明:当x趋向于1时,有:arctanx~x
数学不等式证明题!求证:(1)当0≤x<+∞时,有arctanx≤x; (2)当x>0时,ln
证明:X→0时,arctanx~X
证明当x>-1,且x≠0,ln(1+x)>arctanx/(1+x)