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Q.

If tanx+tan2x+tan3x=tanx tan2x tan3x then |sin3x+cos3x| is equal to

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a

2

b

1

c

-1

d

0

answer is B.

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Detailed Solution

tanx+tan2x=tan3x(1tanxtan2x)

tanx+tan2x1tanxtan2x=tan3xtan3x+tan3x=02tan3x=0

tan3x=0=tan03x=0

sin0+cos0=|0+1|=1

 

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