9.mws

>    restart; problem #9

>    f:=x->((8*x-7)/(7*x-5))^3;  #define our function

f := proc (x) options operator, arrow; (8*x-7)^3/(7*x-5)^3 end proc

>    f1:=D(f); #find derivative

f1 := proc (x) options operator, arrow; 24*(8*x-7)^2/(7*x-5)^3-21*(8*x-7)^3/(7*x-5)^4 end proc

>    simplify(f1(x)); #our answer

27*(8*x-7)^2/(7*x-5)^4