∛(5x+7) = -2
5x+7 = (-2)³
5x+7= -8
5x=-8-7
5x= -15
x= -3
Ответ: -3
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
X^2+6x=0
x*(x+6)=0
x=0 x=0
x+6=0 x+6-6=0-6 x=-6
(√2 - 2√7)^2 = 2 - 2*√2*2√7 + 4*7 = 2 - 4√14 + 28 = 30 - 4√14