Cos(pi-t)
sin(pi)cos(t)-cos(pi)sin(t)
0-(-1*sin(t))
sin(t)=-корень из 3 на 2
t=5pi/6 , 7pi/6
Y = (x - 2)^2 = 8 - x
x^2 - 4x + 4 - 8 + x = 0
x^2 - 3x - 4 = 0
x1 = -1, y1 = 9, x2 = 4, y2 = 4
Б) lg250+lg20-lg5= lg250×20÷5= lg5000÷5= lg1000=3
а) log3 900 -2log3 10= log3 900÷100= log3 9= 2
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