Which of the following is not a trig identity?

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

For how answer my question this will be the last question can you answer in math subject

Find the roots of the equation below. x^2 - 6 + 9 = 0