Mathematics, 23.06.2020 23:01, yzafer9308

Prove that :
cos(x/4)=3/8+1/2cosx+1/8cos2x
anyone plz help me with this

Answers: 3

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Prove that :
cos(x/4)=3/8+1/2cosx+1/8cos2x
anyone plz help me with this...