Find the general solution of the equation sin x + sin 3x + sin 5x = 0.
Given equation is
sin x + sin 3x + sin 5x = 0
Formula to be used:Applying the formula we get,
⇒ (sin x+ sin 5x) + sin 3x = 0
⇒
+ sin 3x = 0
⇒ 2 sin 3x cos (-2x) + sin 3x= 0
( ∵ cos (-θ ) = cos θ )⇒ sin 3 x (2 cos 2 x + 1) = 0
⇒ sin 3x = 0 or 2 cos 2x +1 = 0
Now, ![]()
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Now, 2 cos 2x +1 = 0
⇒ ![]()
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⇒
where n ∈ Z and Z is set of integers
⇒
where n ∈ Z
∴ the general solution of the equation is
where n ∈ Z and Z is set of integers
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