tan1°.tan2°.tan3°.....tan89°
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tan 1 . tan 2 . tan 3 … tan (90 – 3 ) . tan ( 90 – 2 ) . tan ( 90 – 1)
tan 1 . tan 2 . tan 3 … cot 3 . cot 2 . cot 1
tan 1 . cot 1 . tan 2 . cot 2 . tan 3 . cot 3 … tan 89 .
cot 89We know that tanA.
cotA=11 x 1 x 1 x 1 x … x 1
As 1ⁿ = 1
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