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CHAPTER 4. TRIGONOMETRY
4.3. Signs of Trigonometric Functions
379. = nì~Çê~åí= páå `çë q~å `çí pÉÅ `çëÉÅ=
= α = α = α= α= α = α =
f= H= H= H= H= H= H=
ff= H= = = = = H=
fff= = = H= H= = =
= fs= = H= = = H= =
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380. =
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Figure 65.
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