16. If f(s) and 9(3) are one-variable functions, let u(m,t) be the two-variable function u(m,t) = f(a: + at) + 9(22 at). Compute the second
16. If f(s) and 9(3) are one-variable functions, let u(m,t) be the two-variable function u(m,t) = f(a: + at) + 9(22 at). Compute the second partial derivatives um and um and verify that a\" = 031$\
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