Return to Assignments Unit circle and simple formulas
Assignment 4
Show using the unit circle:
Solution
has a negative projection on the 
-axis equally large as the positive projection of 
on the -axis.
has a positive projection on the 
-axis equally large and having the same sign as the projection of 
on the -axis.
For the third formula we use the following definition of 
in combination with some formulas concerning and :
Thus:
