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help please! 6. [Maximum mark: 13] In Triangle ABC. BC = a. AC = b. AB = c and [BD] is perpendicular to [AC]. C

help please!

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6. [Maximum mark: 13] In Triangle ABC. BC = a. AC = b. AB = c and [BD] is perpendicular to [AC]. C (a) Show that CD = b - c cosa. [2] (b) Hence, by using Pythagoras' theorem in the triangle BCD, prove the cosine rule for the triangle ABC. (4] (c) If ABC = 60", use the cosine rule to show that c = =at (7]

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