Avoiding Bad Line Breaks

Since MathJax uses nesting level as it determines breakpoints, using extra braces can help prevent bad line breaks. 
\cos(\theta+\phi)
   = \cos(\theta)\cos(\phi)
   - \sin(\theta)\sin(\phi)
\[ \cos(\theta+\phi) = \cos(\theta)\cos(\phi) - \sin(\theta)\sin(\phi) \] 
\cos(\theta+\phi)
   = {\cos(\theta)}\cos(\phi)
   - \sin(\theta)\sin(\phi)
\[ \cos(\theta+\phi) = {\cos(\theta)}\cos(\phi) - \sin(\theta)\sin(\phi) \]
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