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What graph correctly matches the equation y equals two negative x

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).