algorithm - Insertion sort expenditure -

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I have tried to prove that an integration with binary search needs to be sorted. Tried to use but i hung up

t_w (1) = 0

t_w (n) & lt; = Log_2 (n-1) + 2 + t_w (n -1)

and

t_w (n) & lt; = N log n

with n = 2 ^ k; Epiclon N

I do not know how to solve it: t_2 (2 ^ k + 1) & lt; = Log_2 (2 ^ k) + 2 ^ k * log_2 (2 ^ k) how to go? Where's my fault

Thank you for your help


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