$$ a=\sin 16^{\circ}-\sin 216^{\circ} ; $$ $$ b=\cos 130^{\circ}-\cos 296^{\circ} ; $$ $$ c=\operatorname{tg} 140^{\circ}-\operatorname{tg} 220^{\circ} \quad $$ sonlarining ishoralarini aniqlang. $$ \begin{array}{ll} ext { A) }+;+;+ & ext { B) }+;-;+ \ ext { C) }-;-;+ & ext { D) }+;-;-\end{array} $$

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$$ a=\sin 16^{\circ}-\sin 216^{\circ} ; $$ $$ b=\cos 130^{\circ}-\cos 296^{\circ} ; $$ $$ c=\operatorname{tg} 140^{\circ}-\operatorname{tg} 220^{\circ} \quad $$ sonlarining ishoralarini aniqlang. $$ \begin{array}{ll}	ext { A) }+;+;+ & 	ext { B) }+;-;+ \ 	ext { C) }-;-;+ & 	ext { D) }+;-;-\end{array} $$

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Berilgan ifodalarning ishoralarini aniqlash uchun ularni ketma-ket tahlil qilamiz. 1. **$$ a = \sin 16^{\circ} - \sin 216^{\circ} $$** - $$\sin 16^{\circ} \approx 0.2756$$ - $$\sin 216^{\circ} = \sin (180^{\circ} + 36^{\circ}) = -\sin 36^{\circ} \approx -0.5878$$ - $$ a \approx 0.2756 - (-0.5878) = 0.2756 + 0.5878 \approx 0.8634 $$ **Natija:** $$ a > 0 $$ (musbat) 2. **$$ b = \cos 130^{\circ} - \cos 296^{\circ} $$** - $$\cos 130^{\circ} = \cos (180^{\circ} - 50^{\circ}) = -\cos 50^{\circ} \approx -0.6428$$ - $$\cos 296^{\circ} = \cos (360^{\circ} - 64^{\circ}) = \cos 64^{\circ} \approx 0.4384$$ - $$ b \approx -0.6428 - 0.4384 \approx -1.0812 $$ **Natija:** $$ b < 0 $$ (manfiy) 3. **$$ c = an 140^{\circ} - an 220^{\circ} $$** - $$ an 140^{\circ} = an (180^{\circ} - 40^{\circ}) = - an 40^{\circ} \approx -0.8391$$ - $$ an 220^{\circ} = an (180^{\circ} + 40^{\circ}) = an 40^{\circ} \approx 0.8391$$ - $$ c \approx -0.8391 - 0.8391 \approx -1.6782 $$ **Natija:** $$ c < 0 $$ (manfiy) Demak, ishoralar: - $$ a > 0 $$ - $$ b < 0 $$ - $$ c < 0 $$ Javob variantlarini ko'rib chiqsak: - **D) +; -; -** **To‘g‘ri javob: D)** A) +; +; + B) +; -; + C) -; -; + D) +; -; - Natija: D) +; -; -

sonlarining ishoralarini
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