Find the derivatives of the following functions
a) y = 5x^{4} +3x -1-x^{3}
b) y = (x+1)^{-1/2 }
c) y= e^{x2+1}
d) y= e^{3x} lnx
e) y =ln(x+1/x)y
f) Y= 1+ sin x/1-cos x