Messy typesetting problem

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If I enter the followng in a sage notebook, the typeset output is correct but for h(r) is unreadable, is there someway to coerce sage to output a reasonable representation?

The desired expression is $$h(r) = {1\over{r^2 \sqrt{ \frac{1}{b^2} - (1 - \frac{d}{r}) \frac{1}{r^2}}}}$$

f(r) looks good, g(r) is poor and confusing, h(r) is unreadable.

var ('r, b, d')
f(r) = r^2 * sqrt(1/b^2)    
print(f)    
f.show()
g(r) = r^2 * sqrt(1/b^2 - 1)
print(g)
g.show()
h(r) = 1 / (r^2 * sqrt (1/b^2 - (1 - d/r)*1/r^2))
print (h)
h.show()