求达人解四道函数题1.f(x)=4ln(6x+5ln(x)) f'(x)=?f'(4)=?2.f(x)=4ln(ln(x)) f'(x)=?3.y=2^x+13/x^6 f'(x)=?4.f(x)=ln((2x+9)/(7x-5))^(1/2) f'(x)=?如方便,请附上解题步骤,感激不尽!

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