Q. 13

# Mark the Correct

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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