Find the unit tangent vector $T(t)at$ point $P.$

$r(t)=($:$5cos(t),5sin(t),4$:$),P(\frac{5}{\sqrt[\phantom{2}]{2}},\frac{5}{\sqrt[\phantom{2}]{2}},4)$

Find a set $of$ parametric equations for the line tangent $to$ the space curve $at$ point $Pt$ for the variable $of$

parametrization.