jessicapriwstleg56 jessicapriwstleg56

25-01-2021
Mathematics

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2cos^2A-cos2A-1=0
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kenlingdad kenlingdad

25-01-2021

Answer:

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Step-by-step explanation:

Are you going to solve the value of A or just a proof the equation

cos 2A = cos² A - sin² A

2cos²A-cos2A-1 = 2cos²A - (cos² A - sin² A) - 1 = cos² A + sin² A - 1

2cos²A-cos2A-1 = 1 - 1 = 0

A: 90° or 270° or 450° .....

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