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Prove that: (cos7A+cos5A)/(sin7A-sin5A...

Prove that:
`(cos7A+cos5A)/(sin7A-sin5A)=cotA`

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(cos 7A + cos 5A)/(sin 7A-sin 5A)=

(cos 7A + cos 5A)/(sin 7A-sin 5A)=