1/z=1/x + 1/y= (y+x)/xy
z= xy/(x+y)
1/x = 1/y + 1/z
solve for Z
2 answers
oops, sign problem
1/z=1/x -1/y= (y-x)/xy
z= xy/(y-x)
check my work
1/z=1/x -1/y= (y-x)/xy
z= xy/(y-x)
check my work