Task 3 - Parametric Curve

Slide t from left to right. a) In what interval the slope of the tangent line is positive? b) In what interval the slope of the tangent line is negative? c) What is the value of t that the slope of the tangent line is 0? d) What is the value of t that the slope of the tangent line does not exist? Verify the answer of a, b, c and d with the value of  at t in part a, b, c, d.