A) \[\left( {{R}^{2}}\text{+}R+1 \right)\left( 2R \right)=1\]
B) \[\left( {{R}^{2}}R+1 \right)\left( 2-R \right)=1\]
C) \[\left( {{R}^{2}}R1 \right)\left( 2R \right)\,\,\text{=}\,1\]
D) \[\left( {{R}^{2}}+R1 \right)\left( 2R \right)=1\]
Correct Answer: A
Solution :
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