To show: The result ∂2z∂t2=∂2z∂x2(∂x∂t)2+2∂2z∂x∂y∂x∂t∂y∂t+∂2z∂y2(∂y∂t)2+∂z∂x∂2x∂t2+∂z∂y∂2t∂t2.
The similar formula for ∂2z∂s∂t.
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