The value of $\tan 1° \times \tan 2° \times \tan 3°\times \ldots \times \tan 89°$ is

0
1
-1
1/2

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tan1

tan2tan3 ...............tan44 = cot46cot47cot48.........cot89 = ( 1/ (tan46 *tan47 *tan48 ...... ................................... tan89 )............. therefore this whole sequence is equal to nothing but tan(45) ........which is equal to 1 !!!!!!!!