(a-6)(a+6)+(3-a)(3+a)=а²-36+9-а²=-27
Ответ:
1
Объяснение:
1 + cos(2α) - sin(2α) / cos(α) + cos(π/2+α) = 2cos(α)^2 - 2cos(α)sin(α) / cos(α) - cos(π-π/2-α) = 2cos(α) (cos(α)-sin(α))/cos(α) - cos(π/2 -α) = 2cos(α) (cos(α)-sin(α))/cos(α)-sin(α) =2cos(α) = 2cos(2π + π/3) = 2cos(π/3) =1
<span>-30by</span>²<span>-6b</span>²=-6b(5y²+b)
Вот так. Если непонятно-пиши