Find all the complex roots. Write the answer in the indicated form. 11) The complex fourth roots of -16 (rectangular form) A) 2 + i, 2-i, -2+i, -2-i 11) B) 1 + i, 1- i, -1+ i, -1-i C) 8\\2 + 8 2i, 8V2 - 821, -8V/2 + 82i, -812 - 8 2i D) V2+ 2i, V2 - V2i, - V2 + V2i, - V2 - V2i Find the unit vector that has the same direction as the vector v. 12) v= -3i+ j 1 12) A) u=- -310 10 -1+ 10 V10j B) uz- -3 17 Vllit 17V11j C) u = V10 -3 -i+ 10j D) u =-3 10i + ~10j Complete the identity. 13) (cot x + 1)(cot x + 1) - csc4 x _ ? cot x 13 A) 0 B) 2 C) cot x D) 1 nd projwV. 14) v = 2i + 3j; w =8i - 6j 4 4 A) - 13 (1- 3j) B) - 1 25 (4i - 3j) C) - 325 (1 - 6j) D) - =(i-6j)