CHAPTER 4. TRIGONOMETRY4.4 Trigonometric Functions of Common
Angles
381. =
α°= αê~Ç= ëáåα= Åçëα= í~åα= Åçíα ëÉÅα= ÅçëÉÅα=
M= M= M= N= M= ∞= N= ∞=PM=
Sπ
=
ON
=
O
P
=
P
N
= P=
P
O
= O=
QR=
Q
π
=
OO
=
O
O
= N= N= O= O=
SM=
P
π
=
OP
=
O
N
= P=
P
N
= O=
P
O
=
VM=
O
π
= N= M= ∞= M= ∞= N=NOM=
P
Oπ
=
OP
=
O
N
− = − P=
P
N
− O− =
P
O
=
NUM= π=M=−N= M= ∞=N− = ∞=
OTM=
O
Pπ
= −N= M= ∞= M= ∞=N− =PSM= O =π M= N= M= ∞= N= ∞=
= = = = = = = = = = = = =