CHAPTER 4. TRIGONOMETRY
387.
α
α
α=
ëáå
Åçë
Åçí =
=
- í~åα⋅Åçíα=N=
=
- α
α=
Åçë
N
ëÉÅ =
=
- α
α=
ëáå
N
ÅçëÉÅ =
=
=
=
4.6 Reduction Formulas
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391. =
=
β= ëáåβ= Åçëβ= í~åβ= Åçíβ=
−α= −ëáåα= +Åçëα= −í~åα= −Åçíα=
VM°−α= +Åçëα= +ëáåα= +Åçíα= +í~åα=
VM°+α= +Åçëα= −ëáåα= −Åçíα= −í~åα=
NUM°−α +ëáåα= −Åçëα= −í~åα= −Åçíα=
NUM°+α −ëáåα= −Åçëα= +í~åα= +Åçíα=
OTM°−α −Åçëα= −ëáåα= +Åçíα= +í~åα=
OTM°+α −Åçëα= +ëáåα= −Åçíα= −í~åα=
PSM°−α −ëáåα= +Åçëα= −í~åα= −Åçíα=
=PSM°+α +ëáåα= +Åçëα= +í~åα= +Åçíα=
=
=
=
=
=