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i can get the full formulas but i cannot put it together as a general formula:

n=1 (1st der): (1/2)(x^-1/2)

n=2 (2nd der): (1/2)(-1/2)(x^-3/2)

n=3 (3rd der): (1/2)(-1/2)(-3/2)(x^-5/2)

n=4 (4th der): (1/2)(-1/2)(-3/2)(-5/2)(x^-7/2)

...

nth der = ???

i have it right so far, correct? i just cant figure out how put it in terms of n (is it an arithmetic series or something)?

thanks.