9. Determine whether the ratios 5/6 and 10/18 are proportional.

a. proportional
b. not proportional

Which translation maps the vertex of the graph of the function f(x) = x2 onto the vertex of the function g(x) = x2 – 10x +2?

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

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