Question: Evaluate the vector-valued function at each given value of t. (If an answer does not exist, enter DN r(t) = cos(t)i + 9 sin(t)j (a)

Evaluate the vector-valued function at each given value of t. (If an answer does not exist, enter DN r(t) = cos(t)i + 9 sin(t)j (a) r(0) = (b) r(1/ 4 ) = (c) r(8 - 7) = (d) r(7/6 + At) - r(7/6) =

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