А) =(а-3b)^2
б) =(4a+b)^2
в) =(2/3a - 3/2b)^2
г) =(1/2a -b)^2
д) =(1-ab)^2
е) =(a^2+b)^2
1) x²=25, x=5
2) y²=-4, нет корней
3) y⁴=81, y=3
A) P-3e=m*a; P= m*a +3e
b) 4-5P=2S; -5P=2S; 5P=-2S; P= -2S/5
c) kP=y-4c; P= (y-4c)/k
d) 2-P=3y/L; -P=(3y/L)-2; P=-(3y/L)+2
(1-cos2a)^5/32+(1+cos2x)^5/32=29/16*cos^42a
(1-cos2x)^5+(1+cos2x)^5=58cos^42x
cos2x=t
(1-t)^5+(1+t)^5=58t^4
1-5t+10t²-10t³+5t^4-t^5+1+5t+10t²+10t³+5t^4+t^5=58t^4
58t^4-10t^4-20t²-2=0
24t^4-10t²-1=0
t²=a
24a²-10a-1=0
D=100+96=196
a1=(10-14)/48=-1/12⇒t²=-1/12 нет решения
a2=(10+14)/48=1/2⇒t²=1/2⇒t=-1/√2 U t=1/√2
cos2x=-1/√2 U cos2x=1/√2
2x=+-3π/4+2πk U 2x=+-π/4+2πk
x=+-3π/8+πk U x=+-π/8+πk,k∈z