Example 17: Prove that:
sin x -sin 5x + sin 9x -sin 13x
cos x – cos 5x – cos 9x + cos 13x
= cot 4x.
sol​

Example 17: Prove that:
sin x -sin 5x + sin 9x -sin 13x
cos x – cos 5x – cos 9x + cos 13x
= cot 4x.
sol​

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