यदि ` x+ y +z = xyz` , तो सिद्ध कीजिये कि-
(a ) ` (3x-x^(3))/(1-3x^(2) )+(3y-y^(3))/(1-3y^(2))+ (3z-z^(3))/(1-3z^(2))` ` = (3x-x^(3))/(1-3x^(2))* (3y-y^(3))/(1-3y^(2))* (3z-z^(3))/(1-3z^(2))`
(b) ` (x+y)/(1-xy)+ (y+z)/(1-yz)+(z+x)/(1-zx)` ` = (x+y)/(1-xy)* (y+z)/(1-yz)*(z+x)/(1-zx)`