Use:
√x = x1/2
By the Power Rule (Decrease the power by 1. Multiply by the original power.):
d/dx √x = d/dx x1/2 = 1/2 x-1/2
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The square root of the fifth root of x is the tenth root of x.
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The derivative of ANY constant expression - one that doesn't depend on variables - is zero.
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Square root of x = x^0.5