x -3 -2 -1 0 1 2 3
y 9 4 1 0 1 4 9
y=x² - квадратичная функция
график:парабола
a³ - b³ = (a - b)(a² + ab + b²)
(x - 1/x)² = x² - 2x*1/x + 1/x² = x² + 1/x² - 2
x² + 1/x² = (x - 1/x)² + 2
a = x
b = 1/x
x³ - 1/x³ = ( x - 1/x)(x² + x*1/x + 1/x²) = (x - 1/x)(x² + 1/x² +1) = (x - 1/x)((x - 1/x)² + 2 + 1) = (x - 1/x =0.2) = 0.2*( 0.2² + 3) = 0.2 * 3.04 = 0.608
Сначала находим значения sin(70) и т.д.
1) sin(70)=0,9
sin(50)=0,2
sin(10)=0,8
<span>2) 0,9^2*0.2^2*0.8^2=0.81+0.04+0.64=1.49</span>
12-(2x-y)-2(5x-2)+3,3y=12-2x+y-10x+4+3,3y=16-12x+4,3y
3(2-3y)-2(5x-y)-0,7y-2,3=6-9y-10x+2y-0,7y-2,3=3,7-10x-7,7y