Mathematics, 24.07.2019 13:00 shiyaharper
Prove the identity (cosx+cosy)^2+(sinx-siny)^2= 2+2cos(x+y) if at all possible, provide a two-columned answer, explaining each step. you : d
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Prove the identity (cosx+cosy)^2+(sinx-siny)^2= 2+2cos(x+y) if at all possible, provide a two-colum...
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