When x tends to 0, (root sign (1 + x) - root sign (1-x)) / X asks for the help of God
The numerator denominator is multiplied by √ (1 + x) + √ (1-x) to 2 / [√ (1 + x) + √ (1-x)]. When x tends to 0, the above formula tends to →: 2 / 2 = 1
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