With the usual meaning for a,b,c and s if `Delta` be the area of a triangle then the error in `Delta` resulting from a small error in the measurement of c, is

Options

A. `Delta/4(1/s+1/(s-a)+1/(s-b)-1/(s-c))deltac`
B. `1/4(1/s+1/(s-a)+1/(s-b)+1/(s-c))deltac`
C. `Delta/4(1/s+1/(s-a)+1/(s-b)+1/(s-c))`
D. `(1/s+1/(s-a)+1/(s-b)+1/(s-c))deltac`

Answer

A