Question: Use Eq. (11) to find the t-intervals on which c(t) = (t 2 , t 4 4t) is concave up. dy x'(1)y(t)- y'(1)x(t) dx

Use Eq. (11) to find the t-intervals on which c(t) = (t2, t4 − 4t) is concave up.

dy x'(1)y

dy x'(1)y"(t)- y'(1)x"(t) dx x'(1)

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