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12-09-2022
Mathematics

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(a) Given that is small, use the small angle approximation of cos to show that 4 cos (0) + cos² (20) ≈ 5-60² +40¹ (b) Hence find an approximation of 4 cos (0) + cos² (20) when 0 = 3° (c) Calculate the percentage error in your approximation

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