please help this function questions in injective, surjective , bijective with clear steps, thank you

6. (12 marks) For each of the following determine whether the function is injective, surjective and/or bijective justifying your answer in each case. [ You may sketch the function to help your work. ] (a) f : [-3, 00]-> R (6 marks) f ( x) = (x+4)2 (b) s : 7 5 - [ 1,1] (6 marks) f(x) = cos(2x')