Cos (-25 ) the (-10)

To calculate \( \cos(-25^\circ) \) and \( \cos(-10^\circ) \): 1. **Cosine of a Negative Angle**: The cosine function is even, which means that \( \cos(-x) = \cos(x) \). Thus: - \( \cos(-25^\circ) = \cos(25^\circ) \) - \( \cos(-10^\circ) = \cos(10^\circ) \) 2. **Using a Calculator**: You can use a calculator or trigonometric tables to find the cosine values: - \( \cos(25^\circ) \approx 0.9063 \) - \( \cos(10^\circ) \approx 0.9848 \) Therefore: - \( \cos(-25^\circ) \approx 0.9063 \) - \( \cos(-10^\circ) \approx 0.9848 \) If you need more precise values or have any further questions, feel free to ask!