September 2021 0 18 Report
1) 6sin^2(3x)+sin3xcos3x-cos^2(3x)=2 (однорідне р-ння; в-дь: -(π/12)+πn/3; 1/3arctg3/4+πn/3,nєZ); 2) sinx-sin2x+sin5x+sin8x=0 (використання формул перетворення суми в добуток; в-дь: πn/3; π/7+2πm/7,n,mєZ).
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