- #1
Bashyboy
- 1,421
- 5
Homework Statement
[itex](\cos \theta )x + (\sin \theta )y = 1[/itex]
and
[itex](-\sin \theta )x + (\cos \theta )y = 0[/itex]
Homework Equations
The Attempt at a Solution
Evidently the answer is that [itex]x = \cos \theta[/itex] and that [itex]y = \sin \theta[/itex].
Here is my work:
[itex]x = \frac{1 - (\sin \theta )y}{\cos \theta}[/itex]
Substituting this into the second equation, and simplifying:
[itex]y = \frac{\tan \theta}{\sin \theta tan \theta + \cos \theta}[/itex]
I then took this equation and back-substituted into [itex]x = \frac{1 - (\sin \theta )y}{\cos \theta}[/itex], hoping that everything would simplify such that [itex]x= \cos \theta[/itex]; however, things began to look quite messy. How am I to solve this problem?