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B
y−1y
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C
y1−y
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D
y+1y
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Solution
The correct option is Ay1−y y=x−x2+x3−x4...∞ ...(i) xy=x2−x3+x4...∞ ...(ii) Since |x|<1 Adding i and ii we get (1+x)y=x 1+xx=1y using component-dividend method 1+x−xx=1−yy 1x=1−yy x=y1−y for |x|<1