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If f(x)=x^(n), then the value of f(1)-(...

If `f(x)=x^(n)`, then the value of `f(1)-(f'(1))/(1!)+(f''(1))/(2!)-(f'''(1))/(3!)+(f''''(1))/(4!)-....+((-1)^(n)f^(n)(1))/(n!)` is

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