Use vector method to prove the subtraction formula for cosine function i.e,prove that cos(A-B)=cosA.cosB+sinA.sinB

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xojade

08.11.2022

Mathematics

c=66 a=35 b=74

Step-by-step explanation:

According to the sum of the internal angles of the triangle is 180 °， The degree of each angle can be calculated

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Use vector method to prove the subtraction formula for cosine function i.e,prove that cos(A-B)=cosA.cosB+sinA.sinB​