That there are no thousands in the number but if it was 42,817 then there would be 2 thousand in the number
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40 is a positive even number
19/40 is in the reduced form as there is no whole number that divides 19 and 40 evenly (remainder zero).
The derivative of 40 is zero. The derivative of any constant is zero.
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Any product of any list of factors is zero, if one of the factors is zero.