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The value of tan81°– tan63° – tan27° + tan9° equals

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The value of tan81°– tan63° – tan27° + tan9° equals

(a)  1

(b)  2

(c)  3

(d)  4 

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1 Answer

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Best answer

Correct option  (d) 4

Explanation:

(tan81°+ tan9°) – (tan63° + tan27°)   = (cot9° + tan9°) – (cot27°+tan27°)

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