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Q.

If x + y + z = xyz then  2x1-x2 =

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a

  2x1+x

b

  2x1-x2

c

  1+x22

d

  1-x2

answer is B.

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Detailed Solution

x+y+z=xyz x=tan A, y=tan B, z=tan C tan A+tan B+tan C=tan A tan B tan C A+B+C=π 2A+2B+2C=π tan2A+tan2B+tan2C=tan2A tan2B tan2C  tan2=π tan2A  2tan x1-tan x2A=π 2tan A1-tan2A  2x1-x2=π 2x1-x2

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