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182 THE MATHEMATICAL PRINCIPLES [BOOK I oe as -r-r- ; and the foreign force subducted as cA, and therefore the remainA .A. ^ c^4 ing force as — -^ ; then (by the third Example) b will be equal to 1. m equal to 1, and n equal to 4 ; and therefore the angle of revolution be 1 — c •tween the apsides is equal to 180