The professor worked the first one out in class. I was able to reason through it myself at home.
True
http://i111.photobucket.com/albums/n149/camarolt4z28/IMG_20111012_175502.jpg
I'm not quite sure about the second. However, since we're dealing with c being a real number, I think it works.
True
http://i111.photobucket.com/albums/n149/camarolt4z28/IMG_20111012_175512.jpg
True
http://i111.photobucket.com/albums/n149/camarolt4z28/IMG_20111012_175502.jpg
I'm not quite sure about the second. However, since we're dealing with c being a real number, I think it works.
True
http://i111.photobucket.com/albums/n149/camarolt4z28/IMG_20111012_175512.jpg