Mathematics · Trigonometry

What is the value of (1 + cot A + tan A)(sin A - cos A)sin A cos Asin3A - cos3A?

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What is the value of (1 + cot A + tan A)(sin A - cos A)sin A cos Asin3A - cos3A?

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What is the value of (1 + cot A + tan A)(sin A - cos A)sin A cos Asin3A - cos3A?

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