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Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6

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Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?