EC DB
=
AE AD
EC
Given
ᎠᏴ
1+
=
1+
AE
AD
Add 1 to both
sides. (1)
AE EC AD
ᎠᏴ
+
=
+
Rewrite 1 as
AE AE
AD AD
AE
either
or
AE
AD
(2)
Pick statement
AD
.
Add expressions
with common
Pick statement
(EC)/(2 AE)=(DB)/(2· AD)
inator. (3)
ent addition
(AE+EC)/(AE+AD)=(AD+DB)/(AE+AD) ate
(AE+EC)/(AE)=(AD+DB)/(AD)