So, product rule is OK for taking the derivative of a dot product.
那么乘积法则对点乘求导没问题。
Rule two: Learn who'sbuying your product, ask them why and give them more reasons.
原则二：了解谁在购买你的产品，问他们为什么购买，并给他们更多的理由。
Rule two: Learn who'sbuying your product, ask them why and give them more reasons.
原则二：了解谁在购买你的产品，问他们为什么购买，并给他们更多的理由。
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