Well you might want the proper definition of powers. a^b = c^[b×log_c(a)]. Since c could be anything we can use the exp function. a^b = e^[b×ln(a)]. A square root would be b=0.5. Of course computing the values of the exp function and the ln function is also difficult to do by hand, but this is the general form of powers. a and b could be any real number and this formula will work.
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