`x-rotation``ANGLE``#!optional``RESULT`procedureReturn the rotation matrix given by a rotation of

`ANGLE`radians around the x-axis. If`RESULT`is`#t`, the returned value will be an f32vector located in non-garbage-collected memory (the memory will still be freed when there are no more references to the matrix). If`RESULT`is not provided, the returned value will be an f32vector located in normal garbage collected memory.