# Thread: Trigonometry : Solving trigonometric functions

1. ## Trigonometry : Solving trigonometric functions

Solve for x:

x = cotx , where x E [0, pi]

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I have no idea how to solve for 'x' in this equation.

dMh

2. You will need to use a numerical method to solve this, try Newton's or the Bisection method.

3. I've never heard of either methods.

I'm taking "pre-calculus" at the moment and haven't learned too much.

4. Originally Posted by dMh
I've never heard of either methods.

I'm taking "pre-calculus" at the moment and haven't learned too much.
graph $\displaystyle y = x-\frac{1}{\tan{x}}$ in your calculator (make sure your calculator is in radian mode) and look for the zero(s) in the given interval.

5. Originally Posted by skeeter
graph $\displaystyle y = x-\frac{1}{\tan{x}}$ in your calculator (make sure your calculator is in radian mode) and look for the zero(s) in the given interval.

Why $\displaystyle y = x-\frac{1}{\tan{x}}$?

Not $\displaystyle y = \frac{1}{\tan{x}} -x$?

6. Originally Posted by dMh
Why $\displaystyle y = x-\frac{1}{\tan{x}}$?

Not $\displaystyle y = \frac{1}{\tan{x}} -x$?
either one will work ... you're looking for the zero(s)