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FSc Math Book2, Ex 7.3, LEC 14: Q 11

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This video lecture from Vectors (F.Sc.second year Mathematics) covers: Question 11 of exercise 7.3. In this question we prove the identity cos (α + β)=cos(α).cos(β) – sin(α).sin(β) using vectors. Find more e-learning material and educational video lectures in Urdu at These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.

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