1.

Tan10 degree.tan45 degree.tan80 degree​

Answer»

Answer:

1 ( Yeah! Its only one )

Step-by-step EXPLANATION:

tan θ = cot ( 90 - θ )

THUS tan 10 = cot ( 90 - 10 ) = cot 80

Thus,

tan 10 . tan 45 . tan 80

  = cot 80 . tan 45 . tan 80

  = cot 80 × tan 80 × 1         (∵  tan 45 = 1 )

  = 1         ( tan θ × cot θ = 1 )

Thus, the answer is UNITY!!

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