- #1
maverick_starstrider
- 1,119
- 6
Hey, I'm looking through Goldstein's and I'm looking at equation 3.51 where it basically says
[tex]\int \frac{dx}{\sqrt{\gamma x^2 + \beta x + \alpha}} = \frac{1}{\sqrt{-\gamma} } arccos \left( - \frac{\beta + 2 \gamma x}{\sqrt{\beta^2 - 4 \gamma \alpha} }\right) [/tex]
Every integral book I look at says it should be what he gets except an arcsin function and the argument is positive not negative. but
[tex] arcsin(-x) \neq arccos(x) [/tex]
What am I missing?
[tex]\int \frac{dx}{\sqrt{\gamma x^2 + \beta x + \alpha}} = \frac{1}{\sqrt{-\gamma} } arccos \left( - \frac{\beta + 2 \gamma x}{\sqrt{\beta^2 - 4 \gamma \alpha} }\right) [/tex]
Every integral book I look at says it should be what he gets except an arcsin function and the argument is positive not negative. but
[tex] arcsin(-x) \neq arccos(x) [/tex]
What am I missing?