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A 21 digit code contains the numbers1-21. How many combinations are possible using each number only once in each combination? Help please! Rewrite tan^4xsinx in terms containing only first degree powers of sine and cosine? How do you find the oxidation number of elements in a redox equation in order to find out what was oxidized and what was reduced? How can air have mass, its invisible? Expain the reproduction of bacteria?

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