Find the indicated difference quotient and simplify your answer.
f (x) = x 3 +3x, f (x +h)− f (x) /h , h does not equal 0
f (x) = 1 /x2 , g (x)− g (3) /x −3 , x does not equal 3.
f (t) = 1 / t −2 , f (t)− f (1)/ t −1 , t does not equal 1.
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