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सिद्ध कीजिए कि ( sin 5 A - sin 7A + s...

सिद्ध कीजिए कि
` ( sin 5 A - sin 7A + sin 8 A - sin 4 A )/( cos 4A + cos 7A - cos 5A - cos 8A)= cot 6A.`

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