График смотри на рисунке ................................................................
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Y = x² + 4x +1 = x² + 2*x*2 + 4 - 4 +1 = (x +2)² -3
вершина параболы (-2; -3)
<span>sin3x*cos2x=sin5x
</span><span>sin3x*cos2x=sin(3x+2x)
</span>sin3x*cos2x=sin3x cos2x+sin2x cos3x
sin2x cos3x=0
1) sin2x=0 2x=πn, n∈Z x=(π/2)n, n∈Z
2) cos3x=0 3x=π/2+πn, x=π/6+πn/3 , n∈Z