Question is:

I sort of have an understanding with this question, but i dont really get it, especially part b) and part c). With a solution, can someone also leave an explanation to what they did, so i can try to understand what you did? Thanks.Quote:

IfAis an acute angle and CosA=4/5, find the values of,

a) sin2A

b) Sin3A

c) Tan3A