If , then the value of is…

MATHEMATICS · Subjective · A Level · Mathematics · Integration · Integration

Problem

If ∫cos⁡6x+cos⁡9x1−2cos⁡5xdx=−sin⁡4xk−sin⁡x+C\int \frac{\cos 6x + \cos 9x}{1 - 2 \cos 5x} dx = -\frac{\sin 4x}{k} - \sin x + C , then the value of kk is .....

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