Find all solutions of the equation. Leave answers in trigonometric form.x2 + 1 - 
i = 0
A. {2 cis 90°, 2 cis 270°}
B. {2 cis 45°, 2 cis 225°}
C. {
cis 60°, 
cis 240°}
D. {2
cis 90°, -2
cis 270°}
Answer: C
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