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Solve the initial value problems in Exercises 11–20 for r as a vector function of t....

Solve the initial value problems in Exercises 11–20 for r as a vector function of t.
15. Differential equation: dr/dt = (tan t)i +(cos(t /2 ))j - (sec(2t))k
Initial condition: r(0) = 3i - 2j + k

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