Certain math fonts and symbols are especially useful when viewing the "Hints and Help" pages for homework.

• A definite integral:   $\displaystyle{\int_1^5 \cos(x)dx}$
• A square root:    $\sqrt{x^2 + 1}$
• An array:    $ A = \left[\begin{array}{cc} x & 4 \\ 6 & -1 \end{array} \right]$
  
  

• The current letter grade cutoffs (as of 04/17/14) are:
  
  

  Grade	Min %
  A	92
  A-	89
  B+	85
  B	81
  B-	77
  C+	72
  C	67
  C-	62
  D+	57
  D	52
  D-	47