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Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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

Look at the hyperbola graphed below. the hyperbola gets very close to the red lines on the graph, but it never touches them. which term describes each of the red lines? o o o o a. asymptote b. directrix c. focus d. axis