1) x^2+10x^2+25+0=11x^2+25
A2=a1+d
a3=a2+d
a4=a3+d
a5=a4+d
f(x)=x(2x+3)
при x=-1
f(-1) = (-1)(2*(-1) + 3) = -(-2+3) = -1
(x+y³)²=x²+2xy³+y⁶; (m²+n²)²=m⁴+2m²n²+n⁴;
(ab+c)²=a²b²+2abc+c²; (x+yz)²=x²+2xyz+y²z²;
(2p+3q²)²=4p²+2·2·3pq²+9q⁴=4p²+12pq²+9q⁴; (3ab²+2c³)²=9a²b⁴+12ab²c³+c⁶;
Tg(Х+3Х)=1, tg 4х =1, 4х = π/4 +πn, n∈Z, x=π/16 + πn/4, n∈Z