TagSetDelayed
 Usage
• f/: lhs := rhs 将 rhs 赋为lhs的延迟值，并对符号 f 关联这个赋值。
Notes
 Further Examples
Nothing is done here.
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This defines a rule for the product of Sin and Cos and associates that rule with the Sin function. Sin has to be unprotected first.
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By storing the rule with Sin instead of the top level operation Times, you avoid slowing down every computation with Times.
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We restore the original behavior of Sin. Clear does not get rid of the built-in definitions for Sin.
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