dik f(x)=2/√(2x-1) maka f'(1) adalah?

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Misalkan:
u = 2
u' = 0
v = √(2x-1)
v' = 1

Maka ↓↓↓
f'(x) = (u'.v - u.v')/v²
f'(x) = (0.√(2x-1) - 2.1)/(√(2x-1))²
f'(x) = (0 - 2)/(2x-1)
f'(x) = -2/(2x-1)
f'(1) = -2/((2.1)-1))
f'(1) = -2/(2-1)
f'(1) = -2/1
f'(1) = -2