Tan-Ad rule and Co-op Rule
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John Napier
Rule one is to never believe anything unless you know it to be true. Rules two is to divide any issue into as many parts as possible for examination. Rule three is to find the easiest solution and work up to the most difficult. Rule four is to list every possible detail of a problem.
The basic rule is that the sum of any two sides must be greater than the third. Then there are the sine and cosine rules which involve the lengths of the sides but also the angles.
There is no one rule to algebra. There are different rules that apply to different functions.
By using The Napier's rule