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

Which best explains why this triangle is or is not a right triangle?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?