Prove that 2sec square - sec 4 theta - 2cosec square theta + cosec 4 theta = cot 4 theta tan 4 theta .
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https://www.meritnation.com/ask-answer/question/prove-that-2sec-2-a-sec-4-a-2cosec-2-a-cosec-4-a/introduction-to-trigonometry/7903829
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