This is for Rajdeep;
Easy method;
(for sin) square root of 0/4, 1/4, 2/4, 3/4, 4/4
for cos;reverse order of sin
tan; sin/cos
cosec;1/sin
sec;1/cos
cot; 1/tan @Meritnation expert; You can mention this method in the lesson
Good job @cheetal. You have explained the method quite well. We are planning for content upgradation and hope to include this method in our subject material.