Objective 2: Test Polar Equations for Symmetry For Exercises 1522, determine whether the tests for symmetry in Table 8-2 detect symmetry with respect to a. The polar axis. Replace (r, 6') by (3', l9). b. The line 9 = %. Replace (r, 19) by (r, if 9). c. The pole. Replace (r, 9) by (r, 6'). Otherwise, indicate that the test is inconclusive. 15.r2= 16 cos 26 16.r=5cos46 17.r=3cos 36 18.r=64c056 19' r: 4 +35in9 20.r=3+25in6 21.r=26 22.r2=9sin26