### Home > CALC > Chapter 11 > Lesson 11.1.1 > Problem11-7

11-7.

Without your calculator, find all values of θ for which these polar curves cross the pole (origin). Then, graph the polar curve on your calculator and verify your answers.

A polar curve intersects the origin when $r = 0$.

1. $r =\operatorname{sin} 3θ + \operatorname{cos} 3θ$

1. $r = 3\operatorname{sin}^2 θ − 2$