In the function legendre(1,-0.7071), the value corresponding to P11(-0.7071) is coming wrong when checked with standard solutions. Matlab is giving the solution as -0.7071. whereas, the actual solution is +0.7071. Please have a look at it. Or please suggest me how to correct it.
One can verify using online calculator in the link. https://keisan.casio.com/exec/system/1287453184