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: