Notice that the rectangular form of the polar equation r

Notice that the rectangular form of the polar equation r cos theta=a is x=a. Thus, the graph of the polar equation r cos theta=a is a vertical line with an x intercept of a. Similarly, the graph of the polar equation r sin theta=b is a horizontal line with a y -intercept of b. Use these observations to graph the polar equations. a. r cos theta=3 b. r sin theta=3 c. r cos theta=-2 d. r sin theta=4