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What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

Which graph represents the parent function of y=(x+2)(x-2)