CHAPTER 4. TRIGONOMETRY4.3. Signs of Trigonometric Functions
379. =
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nì~Çê~åí=
páå
α=`çë
α=q~å
α=`çí
α=pÉÅ
α=`çëÉÅ=
α=
f= H= H= H= H= H= H=
ff= H= = = = = H=
fff= = = H= H= = =
= fs= =H= = =H= =
=
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Figure 65.
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