3:11 I remember it by the third letter of their names. cosec has its third letter as s, which means it is reciprocal of sin, and so on for the sec and cot too
@@THaWoM Ah. So we can only measure from + X axis? See how you have theta (Quadrant 1) and negative theta (quadrant 4) at 7:50 ? Well can I not draw negative theta in quadrant 2? I would just have to go clockwise starting from negative X axis and I would get negative theta in Quadrant 2, no?