1.

 Find the coordinates of the stationary points of the curve

 and determine the nature of each point. Sketch the curve for the values of

 , and lebelling the turning points.

 

2.

 Find the coordinates of the stationary points of the curve

  and determine the nature of each point. Sketch the

 curve for the values of , and lebelling the turning

  points.

 

3.

 The diagram below shows a triangle where AB = 5cm, BC = 7cm and

 in radian. Find the maximum area of the triangle ABC.