please explain in steps

(1 point) For the given position vectors r(#) compute the unit tangent vector T(t) for the given value of t . A) Let r(t) - (cos 2t, sin 2t). Then T( )( B) Let r(t) = (12, 13). Then T(3) = ( C) Let r(t) = cite "j + tk. Then T( 3)= it it k. Note: You can earn partial credit on this