X²+4x-5-m=0
D=16+20+4m=4m+36>0
4m>-36
m>-9
m∈(-9;∞)
x² + y² = (x + y)² - 2xy = 3² - 2* 4= 9 - 8 = 1
y!=(sin(7x-1))!=cos(7x-1)*(7x-1)!=cos(7x-1)*7=7cos(7x-1)
<span>(2*√12-√3)*√12</span> =24 - 6 = 18
Cos ( x - pi/2 ) = 0
x-pi/2 = pi/2 + pi*n, n ∈ Z; (так как arcos(0) = pi/2 * pi*n, n∈Z)
x= pi + pi*n, n ∈ Z