Small fixes for latex/png printing.

* Added space after Out[] prompt and before png data to improve
  look.
* Translating "operatorname" to "" when rendering latex using
  mathtext.

IPython/extensions/sympy_printing.py

@@ -35,6 +35,9 b' def print_basic_unicode(o, p, cycle):'
 def print_png(o):
     """A funciton to display sympy expression using LaTex -> PNG."""
     s = latex(o, mode='inline')
+    # mathtext does not understand \\operatorname to we remove it so functions
+    # like sin, cos can print. We should possible replace it with mathrm.
+    s = s.replace('\\operatorname','')
     png = latex_to_png(s, encode=True)
     return png
 

IPython/frontend/qt/console/rich_ipython_widget.py

@@ -78,6 +78,8 b' class RichIPythonWidget(IPythonWidget):'
             elif data.has_key('image/png'):
                 self._append_plain_text(self.output_sep)
                 self._append_html(self._make_out_prompt(prompt_number))
+                # This helps the output to look nice.
+                self._append_plain_text('\n')
                 # TODO: try/except these calls
                 png = decodestring(data['image/png'])
                 self._append_png(png)