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y= sinx/cosx ; y=?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2