July 2021 0 40 Report
Решить уравнение (я уже начала, но что-то дальше не пойму как):  cos4x =cos²3x cos4x - (1 + cos 6x): 2=0 2cos4x-1-cos6x=0 2(2cos²2x-1)-1-4cos³2x+3cos2x=0 4cos³2x - 4 cos² 2x - 2 cos2x+ 3=0
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