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If tan of angles A,B,C are the solutions...

If `tan` of angles A,B,C are the solutions of the equations `tan^3x+3ktan^2x-3tanx+k=0`, then the triangle ABC is

A

an isosceles triangle

B

an equilateral triangle

C

a right angled triangle

D

none of these

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The correct Answer is:
D
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