let f, g be Function of I[01],(Tunit_circle 3); ( ( for x being Point of I[01] holds f . x = |[(cos (((2 * PI) * r) * x)),(sin (((2 * PI) * r) * x)),0]| ) & ( for x being Point of I[01] holds g . x = |[(cos (((2 * PI) * r) * x)),(sin (((2 * PI) * r) * x)),0]| ) implies f = g )
assume that
A2:
for x being Point of I[01] holds f . x = |[(cos (((2 * PI) * r) * x)),(sin (((2 * PI) * r) * x)),0]|
and
A3:
for x being Point of I[01] holds g . x = |[(cos (((2 * PI) * r) * x)),(sin (((2 * PI) * r) * x)),0]|
; f = g
let x be Point of I[01]; FUNCT_2:def 8 f . x = g . x
thus f . x =
|[(cos (((2 * PI) * r) * x)),(sin (((2 * PI) * r) * x)),0]|
by A2
.=
g . x
by A3
; verum