y=f(x)=1−x÷1+x prove that x=f(y)
variables and limits questions BBA
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y= ( 1 - x)/ ( 1 + x)
use C and D
( y +1)/ (y -1) = 2/ ( -2x)
( y +1)/ ( y -1) = -1/x
x= ( 1-y)/ ( 1 + y)
hence x = f( y)
use C and D
( y +1)/ (y -1) = 2/ ( -2x)
( y +1)/ ( y -1) = -1/x
x= ( 1-y)/ ( 1 + y)
hence x = f( y)
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