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Miscellaneous·2024·Easy

In triangle ABC, AB = 16 cm, BC = 63 cm, AC = 65 cm. What is the value of cos2A + cos2B + cos2C?

In triangle ABC, AB = 16 cm, BC = 63 cm, AC = 65 cm. What is the value of cos2A + cos2B + cos2C?

Options

  1. a.

    '-1

  2. b.

    0

    Correct answer
  3. c.

    1

  4. d.

    76/65

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