Suppose I define and take . So . If I take , then . Is this valid? If I look at the original equation, does this also mean ? I'm not sure how to understand division by zero.
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because deriving from is valid only when .
Again, if then is not defined, therefore you can't say that
OK, the problem I'm doing says is always divisible by , so instead, can I say because , and then using the cancellation law, is the same polynomial as ?
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