calculate the first derivatives f(x) for each of the following:
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A)f(x)= 2/3x3/4 + 3/4x2/3+ 5/6x2/3

B) f(x)= 2/5x3/2 + 5/6x3/4 + 5/6x3/2

C) f(x)= 3/4x2/3 +5/6x3/2 + 3/4x3/2