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English Pages 1133 Year 2011
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Trigonometry has always been an underappreciated branch of mathematics. It has a reputation as a dry and difficult subje
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Vitamin D is a secosteroid, fat-soluble vitamin and a hormone precursor that plays an important role in bone metabolism
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The 6-carbon lactone known as ascorbic acid (vitamin C) is an important water-soluble vitamin. It is essential for prese
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