The tangent line to a smooth curve r t f t i g t j h t k at t t is the line that passes through the point f to 9 to h to parallel to v to the curve s velocity vector at to Use r to and r to to find parametric equations for the line that is tangent to the given curve at the given paramete value t to r t int i 1 5 tint What is the standard parametrization for the tangent line X y t Int k to 1 Z Type expressions using t as the variable