Sir in example 12 before 6.2 , AT X=π/6 f'(x) =0 , so we take big bracket ....but in question 4 of 6.2 at x=3/4 f'(x) =0 but we not include big bracket.....why??????
Question
Construct an angle at 90 degree at the initial point of a given ray and justify the construction.
D E and F are the midpoints of the sides BC CA and ab of a triangle ABC show that AB is a parallelogram area of area of ABC and area of ABC