Question 8 Which of the following is a polar form of the complex number Not yet -1+3i? answered Marked out of Select one: 1.00 O a. 2 cos 5 TT 5 TL P Flag question 3 + isin 3 O b. 2 cos- + isin 3 4 TT O C. 2 COS- 71 + isin 3 3 O d. 2 cost + ising Oe. 2 cos 21 2 TL 3 + isin 3 Question 9 Which of the following is the standard form for the product of Not yet V2 cos + isin- and v2 cos 7 TI answered + isin 4 Marked out of 1.00 Select one: Flag question O a. -2i O b. 2 Oc. 1-i O d. -2 Oe. -1 +i