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!