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The partial differentiation of excess hydrostatic pressure overline{u} as a function of r and with respect to x is given by _______

A. ( frac{ overline{u}}{ x}= frac{ overline{u}}{ r} cos - frac{1}{r} frac{ overline{u}}{ } sin )
B. ( frac{ overline{u}}{ x}= frac{ overline{u}}{ r} cos - frac{1}{r} frac{ overline{u}}{ } cos )
C. ( frac{ overline{u}}{ x}= frac{ overline{u}}{ r} sin - frac{1}{r} frac{ overline{u}}{ } sin )
D. ( frac{ overline{u}}{ x}= frac{ overline{u}}{ r} sin - frac{1}{r} frac{ overline{u}}{ } cos )
Answer» B. ( frac{ overline{u}}{ x}= frac{ overline{u}}{ r} cos - frac{1}{r} frac{ overline{u}}{ } cos )


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