Ответы на вопрос:
f(x) = a*cos(2x) + b*sin(4x);
f'(x)= -2*a*sin(2x) + 4*b*cos(4x);
f'(7п/12)= 4 = -2*a*sin(7п/6) + 4*b*cos(7п/3) = 2*a*sin(п/6) + 4*b*cos(п/3) = a + 2*b;
f'(3п/4)= 2 = -2*a*sin(3п/2) + 4*b*cos(3п) = 2*а - 4*b;
a + 2*b = 4;
a - 2*b = 1;
a = 5/2; b = 3/4;
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