What is the relationship between sin(90∘) and sin(−90∘)?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0

Can someone me immediately, this is due by midnight! if you can't see the question, i'll text it to you. show the steps you took to get your answer.