Монгол Бодлогын Сан

Заавар: Эмхэтгэлийн томьёо ашигла. \begin{gather} \cos(-\alpha)=\cos\alpha\\ \sin(180^\circ-\alpha)=\sin\alpha \end{gather}

Бодолт: \begin{align*} \text{Илэрх.}&=\dfrac{\cos(-13)^{\circ}\sin 77^{\circ}+\cos(-77^{\circ})\sin 167^{\circ}}{0.1}+\dfrac{\tg^245^{\circ}}{0.002}\\ &=\dfrac{\cos13^\circ\cdot\sin77^\circ+\cos77^\circ\cdot\sin13^\circ}{0.1}+\dfrac{\tg^245^\circ}{0.002}\\ &=\dfrac{\sin(13^\circ+77^\circ)}{0.1}+\dfrac{1^2}{0.002}\\ &=\dfrac{1}{0.1}+\dfrac{1}{\frac{2}{1000}}\\ &=10+500=510 \end{align*}