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The value of `cotx+cot(60^@+x)+cot(120^@+x)` is equal to

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The value of `cotx+cot(60^@+x)+cot(120^@+x)` is equal to
A. `cot 3x`
B. `tan3x`
C. `3tan 3x`
D. `(3-9tan^(2)x)/(3tanx-tan^(3)x)`
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Correct Answer - D
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