• 2021 June(D06) Math Question 53

    Trigonometry

    - Advanced sin, cos, tan functions

    Choice D

    The Law of Cosines (also called the Cosine Rule) :

    c2=a2+b2−2abcos⁡C=802+1202−2×80×120cos⁡127°=180c^2=a^2+b^2-2ab\cos C=80^2+120^2-2\times 80 \times 120 \cos 127°=180

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