CHAPTER 4. TRIGONOMETRY448.
+ α= π−α
Q ON ëáå OÅçëO ==-
− α= π−α
Q ON ëáå OëáåO ==
=
=4.15 Transforming of Trigonometric
Expressions to Sum
=
450.
( ) ( )
O
Åçë Åçë
ëáå ëáå
α−β− α+β
α⋅ β= ==( ) ( )
O
Åçë Åçë
Åçë Åçë
α−β+ α+β
α⋅ β= ==( ) ( )
O
ëáå ëáå
ëáå Åçë
α−β+ α+β
α⋅ β= ==- α+ β
α+ β
α⋅ β=
Åçí Åçíí~å í~å
í~å í~å ==- α+ β
α+ β
α⋅ β=
í~å í~åÅçí Åçí
Åçí Åçí ==- α+ β
α+ β
α⋅ β=
Åçí í~åí~å Åçí
í~å Åçí ==
=
=