Use sinus based formula for `chebpts1`
Use sinus based formula for `chebpts1`

anntzer/numpy,jakirkham/numpy,charris/numpy,rgommers/numpy,numpy/numpy,jakirkham/numpy,pdebuyl/numpy,mhvk/numpy,rgommers/numpy,mhvk/numpy,jakirkham/numpy,mattip/numpy,madphysicist/numpy,numpy/numpy,numpy/numpy,seberg/numpy,mattip/numpy,mhvk/numpy,endolith/numpy,seberg/numpy,endolith/numpy,charris/numpy,simongibbons/numpy,numpy/numpy,anntzer/numpy,rgommers/numpy,rgommers/numpy,mattip/numpy,madphysicist/numpy,pdebuyl/numpy,pbrod/numpy,pbrod/numpy,endolith/numpy,anntzer/numpy,pbrod/numpy,anntzer/numpy,charris/numpy,seberg/numpy,pbrod/numpy,simongibbons/numpy,charris/numpy,mhvk/numpy,seberg/numpy,madphysicist/numpy,simongibbons/numpy,madphysicist/numpy,madphysicist/numpy,pdebuyl/numpy,endolith/numpy,simongibbons/numpy,pdebuyl/numpy,mhvk/numpy,jakirkham/numpy,mattip/numpy,simongibbons/numpy,jakirkham/numpy,pbrod/numpy