MATLAB7.0中积分上限函数怎么求?如函数是(1+log(x))/(x*log(x))^2,从1积到t.

syms t
y=int('(1+log(x))/(x*log(x))^2','x',1,t)
diff(y,t)
上面的没有办法：
syms t
y=int('sin(x)','x',1,t)
diff(y,t)
你看一下,积分式有误没?