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After rationalising the numerator, [√(1 + x) − √(1 − x)]/x tends to what at 0?
A0
B2
C1/2
D1
Answer & Solution
Correct answer: D. 1
Rationalising gives 2/(√(1 + x) + √(1 − x)), which tends to 2/2 = 1.
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