# Thread: solve x cos(x) = -(3pi+2)/2pi

1. ## solve x cos(x) = -(3pi+2)/2pi

Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi

2. Originally Posted by primer
Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi

I do not think you can using elementary algebraic methods.
But if you want to approximate the solution you can use Newton's-Raphson Method.

3. Originally Posted by primer
Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi