symmetry of polar equations

Directions: Determine if the graph of the polar equation is symmetric with respect to the line 0 = 1/2, the polar axis, and the pole. 1. r = 2+4sino 2. r = 2cos 20 0 0 = 1/2 0 0 = 1/2 O polar axis O polar axis O pole O pole 3. r =1-3cos0 4. 72 = 25 sin 20