Implicit Differentiation at a Point
If $$x^2+y^2=25$$, what is the value of $$\frac{dy}{dx}$$ at the point $$(3,4)$$?
A
$$\frac{4}{3}$$
B
$$\frac{3}{4}$$
C
$$-\frac{3}{4}$$
D
$$-\frac{4}{3}$$
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