Question: If g(s, t) = f(s 2 t 2 , t 2 s 2 ) and is differentiable, show that g satisfies the equation

If g(s, t) = f(s2 – t2, t2 – s2) and  is differentiable, show that g satisfies the equation

ag as +s ag at = 0

ag as +s ag at = 0

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