Express the indicated number in standard notation or trigonometric notation, as directed.Express the indicated number in trigonometric notation. 
A. 2(cos 180° + i sin 180°)
B. 2(cos 90° + i sin 90°)
C. -2(cos 270° + i sin 270°)
D. 2(cos 180° - i sin 180°)
Answer: A
Mathematics
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