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- Thread starter Poppop
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HallsofIvy

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r'= k_ave+ dk- (g_ave+ dg)(r_ave_+ dr)

Now, are you thinking of dk, dg, and dr as functions of some variable (apparently r is since you are using r' but you didn't say what the variable is) or just numbers? If numbers just go ahead and multiply it out. If dk, dg, and dr are very small, you can ignore products like (dg)(dr) and simplify a bit.

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