The following equation is known as_________Equation: \(\frac {1}{2\pi }\int_0^c \frac {\gamma (\xi)d\xi }{(x-\xi)}\)=V∞(α-\(\frac {dz}{dx}\))(Where c is the chord length for a thin airfoil, α is the angle of attack, V∞ is the free-stream velocity, \(\frac {dz}{dx}\) is the slope at point x and γ(x) is the vortex strength at x).

• A. Airfoil equation
• B. The fundamental equation for airfoils
• C. The fundamental equation for symmetric airfoils
• D. The fundamental equation for thin airfoil theory