CHAPTER 4. TRIGONOMETRY=
=
Figure 67.
=- fåîÉêëÉ=q~åÖÉåí=cìåÅíáçå==
ó=~êÅí~åñI=−∞≤ñ≤∞I=
O~êÅí~åñ
Oπ
< <π
− K======= =
=
Figure 68.
dana p.
(Dana P.)
#1