Q. 13 D4.4( 14 Votes )

let us find the value of (tan 1° × tan2° × tan 3°………..tan89°)

Answer :

tan1° tan2° tan3° ……tan87° tan88° tan89°

tan1° tan2° tan3° ……tan(90 - 3)° tan(90 - 2)° tan(90 - 1)°

tan1° tan2° tan3° …..cot3° cot2° cot1°

= 1

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