1. The problem statement, all variables and given/known data Hello, I'm having some trouble with this: 3cosX+4sinX=2. 2. Relevant equations 3. The attempt at a solution It's one of those problems where I've no idea of where to start. Could I possibly subtract 4sinX from both sides to get 3cosX=2-4sinX? And divide both sides by 3 to get cosX=(2-4sinX)/3? If this is right, it's from this point on that I'm confused. Thank you. The other problems were a bit simpler. 2 people, both Calculus tutors, couldn't help me on it.