Q. 7

# Mark the Correct

cos 3x tan 5x = sin 7x 2 cos 3x sin 5x = 2 cos 5x sin 7x

sin 8x + sin2x = sin 12x + sin 2x

sin 8x = sin12x

sin 12x - sin8x = 0

2 sin 2x cos 10x = 0

If sin2x=0

Then, x=0

If cos10x = 0

Then  and x=0 (from above equation sin2x=0)

So, there are 6 possible solutions.

Option C

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