Which of these equations is used for computing the lift and wave drag over a supersonic airfoil?

C p = ( frac {2 }{ sqrt {M_ ^2+1}} )

Cp= ( frac {2 }{ sqrt {M_ ^2-1}} )

Cp= ( frac {2 }{ sqrt {M_ ^2+1}} )

Cp= ( frac { sqrt {M_ ^2-1}}{ } )

Cp= ( frac { sqrt {M_ ^2+1}}{ } )

Which of these equations is used for computing the lift and wave drag

1.	Which of these equations is used for computing the lift and wave drag over a supersonic airfoil?
A.	C<sub>p</sub>= ( frac {2 }{ sqrt {M_ ^2-1}} )
B.	C<sub>p</sub>= ( frac {2 }{ sqrt {M_ ^2+1}} )
C.	C<sub>p</sub>= ( frac { sqrt {M_ ^2-1}}{ } )
D.	C<sub>p</sub>= ( frac { sqrt {M_ ^2+1}}{ } )
Answer» B. C<sub>p</sub>= ( frac {2 }{ sqrt {M_ ^2+1}} )