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Solving 2 unknown variables with 2 equations

 
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Sep2-10, 11:52 AM   #1
 

Solving 2 unknown variables with 2 equations

1. The problem statement, all variables and given/known data
Find F and [tex]\theta[/tex]

2. Relevant equations
Fcos[tex]\theta[/tex] = 250
Fsin[tex]\theta[/tex] = 420

3. The attempt at a solution

I can't remember how to solve 2 equations with 2 unknowns and trig functions... How do I start?
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Sep2-10, 11:55 AM   #2
 
What trigonometric identities do you know that connect the sine and cosine functions?
Sep2-10, 12:07 PM   #3
 
sin2([tex]\theta[/tex]) + cos2([tex]\theta[/tex]) = 1
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