20180119

MATLAB输入程序：

>> syms t
>> diff(1/(1+t^(1/2))+1/(1-t^(1/2)))

结果为：

ans =
 
1/(2*t^(1/2)*(t^(1/2) - 1)^2) - 1/(2*t^(1/2)*(t^(1/2) + 1)^2)