## Solving 2 unknown variables with 2 equations

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

2. Relevant equations
Fcos$$\theta$$ = 250
Fsin$$\theta$$ = 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?
 What trigonometric identities do you know that connect the sine and cosine functions?
 sin2($$\theta$$) + cos2($$\theta$$) = 1