If y ! f "u# and u ! t"x where f and g are twice differentiablefunctions, show that d2
Chapter 3, Problem 3.4.95(choose chapter or problem)
If y ! f "u# and u ! t"x where f and g are twice differentiablefunctions, show that d2 ydx 2 ! d2 ydu2 ! dudx $2%dydud2udx 2
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