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9. Given that u(t)=i2tj+3tk and v(t) = ti+ costj + sintk. Find d[u(t) v(t)] and [u(t) v(t)]. d dt

9. Given that u(t)=i2tj+3tk and v(t) = ti+ costj + sintk. Find d[u(t) v(t)] and [u(t) v(t)]. d dt

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