The angle of elevation of the top of a flagpole from a point A on a level ground is 13°.The angle of elevation of the top of the flagpole from another point B nearer the pole and 12m from A is 300. Find;

 The height of the flagpole
 The distance from point B to the top of the flagpole.
 Given that tan ∝ = 0.75, without using tables or a calculator find Cos (180 − ∝)