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  4. If ( sin 2 α- sin 3 α+ sin 4 α/ cos 2 α- cos 3 α+ cos 4 α)= tan k α is an identity then the value of k is equal to -

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Q. If $\frac{\sin 2 \alpha-\sin 3 \alpha+\sin 4 \alpha}{\cos 2 \alpha-\cos 3 \alpha+\cos 4 \alpha}=\tan k \alpha$ is an identity then the value of $k$ is equal to -

Trigonometric Functions

Solution:

Correct answer is (b) 3