taylor(y_,xx_,x0_):=If(type(xx)==Variable,taylor(y,xx,x0,7)); taylor(y_,x_=a_,n_):=If(isnumber(a),taylor(y,x,a,n)); taylor(y_,xx_):=If(type(xx)==Variable,taylor(y,xx,0,7), if(isconstant(xx),taylor(y,x,xx,7) )); taylor(y_,x_=a_):=If(isnumber(a),taylor(y,x,a,7)); taylor(a_*x_^n_,x_):=expand(taylor(a,x,0,7)*x^n); taylor(y_):=taylor(y,x);