self Maths Puzzle

If tan54 = atan18 + b tan36, then a+b is___

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self Other Question

A person has to make 146 pieces of long bar. he take $ seconds to cut piece.what is total time taken by him to make 146 pieces? Find min value of fn: |-5-x| + |2-x|+|6-x|+10-x|; where x is an integer