Currently, LibreOffice does not have the function SKEWP as defined in ODFF1.2.
Winfried Donkers committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=df931a5b0f48707e34ebfacb695996198ece8f44 fdo#60322 add calc function SKEWP as in ODFF v1.2 The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Eike Rathke committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=df77f67090c722f12d3ae7836acbb908064ff193 factor out common code of SKEW and SKEWP, fdo#60322 The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.