Q. 13

# Mark the Correct

Answer :

sin x + sin y = √3 (cos y – cos x)    x + y = 0 or x = -y

or x = -y

or Putting these values of x in sin 3x + sin 3y,

For x = -y

sin 3x + sin 3y

= sin 3(-y) + sin 3y

= -sin 3y + sin 3y

= 0

For sin 3x + sin 3y = sin (3y + π) + sin 3y

= -sin 3y + sin 3y

= 0

So, sin 3x + sin 3y = 0 (Ans)

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