please help me out here and label the answers clearly

For questions 13 - 15, let z, = 2 cos + i sin and z2 = 8 cos 7 x 6 + isin 7 x 6 Calculate the following, keeping your answer in polar form. (2 points each) 13. ZIZZ 14. ZZ\fFor questions 16 - 19, write each expression in the standard form for the complex number a + bi. ( 2 points each) 16. 4 cos ()+ isin( 17. (cos(72") + i sin (72") 18. The complex fifth roots of 5-5 3/ .19. Find all seventh roots of unity and sketch them on the axes below. W/y 371 6 1171 6 6 4 4 3 3 2