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How to substract one sine from another upon the line of natural sines.
The substracting of one sine from an∣other, is no more than taking the distance from the lesser to the greater on the line of sines, and that distance applyed to the line from the beginning, gives the residue or re∣mainer. Ex. gr. To substract 20 from 37 I take the distance from 20 to 37 that apply∣ed to the line from the beginning gives 15 for the sine remaining.