## Question

###### Prove the identity. $$\frac{\cos (6 y)+\cos (8 y)}{\sin (6 y)-\sin (4 y)}=\cot y \cos (7 y) \sec (5 y)$$

Prove the identity. $$\frac{\cos (6 y)+\cos (8 y)}{\sin (6 y)-\sin (4 y)}=\cot y \cos (7 y) \sec (5 y)$$

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