Solve the trigonometric equation symbolically, graphically, or numerically for 
cot2 ? + cot ? = 0
A. ? = 90°, 135°, 270°, 315°
B. ? = 45°, 90°, 270°, 225°
C. ? = 0°, 90°, 180°, 270°
D. ? = 0°, 135°, 180°, 315°
Answer: A
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A. 
B. ?
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