<a href="http://www.codecogs.com/eqnedit.php?latex=f(x) = -\sqrt{36 -x^2}\\\\ f(-x)= -\sqrt{36 -(-x)^2} \\\\\ ~~~~~~~~~=-\sqrt{36-x^2} \\\\ ~~~~~~~~~=f(x) \\\\ f(-x) = f(x) ~,~\therefore even function" target="_blank"><img src="http://latex.codecogs.com/gif.latex?f(x) = -\sqrt{36 -x^2}\\\\...