Q. 275.0( 2 Votes )
Mark the correct A. 0
B. 1
C. 1/2
D. not defined
Answer :
tan 1° tan 2° tan 3° ... tan 89° = tan (90° - 89° ) tan(90° - 88° ) tan(90° - 87°) ... tan(90° - 46° ) tan 45° tan 46° …. tan 89°
= cot 89° cot 88° cot 87° ….. cot 46° tan 45° tan 46° ….. tan 89°
(∵ tan(90° - θ ) = cot θ )
= tan 45°
= 1
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