1) = - 2 Sin45 Sin20 = - √2Sin 20
2) = 2Cos70Cos40
3) = 2Sin 45Cos25 = √2Cos25
4a^2-24a^2-ab+6ab+25ab-3a^2=-23a^2+30ab
Ответ:
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Объяснение:
3*(1^3- 8*y^3)+4(6 * y^3 - 1) = 3 - 24*y^3 + 10*y^3 -1= 2 - 14*y^3