the given position vectors r(t) compute the unit tangent vector T(t) for the given value of t . A) Let r(t)=(cos 5t,sin 5t). Then T(π/4)= (  ,  ) B) Let r(t)=(t^2,t^3). Then T(5)= (  ,  ) C) Let r(t)=e^(5t)i+e^(−5t)j+tk Then T(2)=  i+  j+  k .

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