NProduct
 Usage
• NProduct[f,  i, imin, imax ]给出乘积  的数值近似. • NProduct[f,  i, imin, imax, di ]在乘积中使用一个 di的步长.
Notes
• 参见 NSum的注释.可选项 NSumExtraTerms 和 NSumTerms使用 NProductExtraFactors以及 NProductFactors替换.
 Further Examples
This gives approximations to the factorial function.
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Here is an exact value that we will use for comparison.
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The numerical product is not very accurate.
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Increasing NProductFactors improves the result.
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