Why is sinx not polynomial ?
How can I show that the points -LSB- math -RSB- P -LRB- 2,-3 -RRB- , Q -LRB- 3,1 -RRB- -LSB- / math -RSB- and -LSB- math -RSB- R -LRB- 5,9 -RRB- -LSB- / math -RSB- are collinear ?