SAI SARDAR10 Years agoTAN 75=TAN ( 45 + 30 )=(TAN 45 + TAN 30 ) / ( 1-TAN 45 TAN 30 )=(1+1÷√3)÷(1−(1×1÷√3))=3.732050808 ANSWER IS TAN75 = 3.732050808. IF YOU LIKE THIS ANSWER PLZ APPROVE IT.