PLEASE ANSWER WILL LEAVE A GOOD REVIEW MATH IS GRADE 12 LEVEL

1) What is the opposite of x = 10 ^ y?

1a) What is another way of writing the above answer? 2) If the product is 729 and the base is 9

2a)Please write the appropriate expression and solve ( from question 2) 2b) Is there another way to answer this question (2) 3) The function f(x) = 4 cos (x +) - 1 has already undergone transformations. What are they? 3a) How can this expression be written in terms of sine?