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Q.

2sinxsin3x+tanxtan3x=

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

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  2sin xsin3x+tan xtan3x =2sin xsin3x+sin xcos x·cos3xsin3x =2sinx cos x+sin x cos3xsin3x cos x =sin2x+12(2cos3x sin x)sin3x cos x =sin2x+12(sin4x-sin2x)sin3x cos x =12 (sin4x+sin2x)sin3x cos x =12 2sin3x cos xsin3x cos x =1

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