Mathematics, 02.04.2021 04:00, backkennedi

PLEASE NEED HELP, don't understand it and been at it for hours given the equation for cos (a + b) determine what the cos(2a)=? hint think of a way to represent 2a by adding

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PLEASE NEED HELP, don't understand it and been at it for hours given the equation for cos (a + b) d...