Question 425232
Evaluate log2(log5 5).

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The log of its base is always equal to 1. This answers the question: What number do I raise the base to equal itself.  For example, for base 3, what number do I raise 3 to equal 3? You can see this will be 1 and it will hold for any base. Remember, the base raised to the logarithm of a number is equal to the number.
log5 5=1
log2(log5 5)=log2(1)
what do you raise the base 2 to get 1?
zero, as 2^0=1
ans:
log2(log5(5))=0