product of tan1 degree tan2 degree............tan 89degree is

tan1 canbe written as cot 89

so ,

 the expression is changed as 

  (cot 89*)(cot 88*)............cot46* tan45* tan46*...............tan89*

 all get cancelled ,

 which remains tan45 = 1,

so the ans is 1.

please approve my answer

tan1 cancels out tan89. cause tan89 = cot1.

similarly tan2 cancels out tan88.

this goes on untill we get tan45. so anwer = 1.

Answer is 1.

plz approve ...