Science:Math Exam Resources/Courses/MATH152/April 2013/Question A 02/Hint 1

The projection ${\text{Proj}}_{c}a$ is the projection of $a$ onto $c$. If you remember the formula for this, you may use it directly. If you don't remember the formula, check the diagram below with $a$, $c$, and ${\text{Proj}}_{c}a$. Use the picture to help you deduce the formula.