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Example: Fibonacci

Fibonacci(n)
$\;\;\;\;\;$ if n < 2
$\;\;\;\;\;$ then return n
$\;\;\;\;\;$ else return Fibonacci(n-1) + Fibonacci(n-2)

T(n) = $\left\{ \begin{array}{ll} 1 & {\rm if} \; n < 2 \\ T(n-1) \; + \; T(n-2) \; + \; \Theta(1) & {\rm if} \; n >= 2 \end{array} \right.$

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