Question: Find -[r(t) . u(t) ] and [r(t) x u(t)] in two different ways. dt dt r(t) = cos ti + sin tj + tk,

Find -[r(t) . u(t) ] and " [r(t) x u(t)] in

Find -[r(t) . u(t) ] and " [r(t) x u(t)] in two different ways. dt dt r(t) = cos ti + sin tj + tk, u(t) = j+ tk dt (a) [r(t) . u(t) ] (i) Find the product first, then differentiate. (ii) Apply the properties of the derivative. (b) [r(t ) x u(t) ] dt (i) Find the product first, then differentiate. (ii) Apply the properties of the derivative

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