<span>(7b^2-4b 2)-(5b^2-3b 7)=(b*(7b+4*2)-b*(5b-3*7)=(b*(7b-4*2))-b*(5B-21)=b*(7b-8)-b*(5b-21)=b*(7b-8-5b+21)=b*(2b+13)</span>
f(x-4)=(x-4)^2. Приравняем: (x-4)^2=x^2, x^2-8x+16=x^2, -8x=-16, x=2
1) 2sin32*cos32/sin64 = sin2*32/sin64=sin64/sin64 = 1
2) -6sin32/sin16sin74 = -12sin32/2sin16cos16 = -12sin32/sin32 = -12
3) -9sin136/cos68*cos22 = -9sin136/cos68sin68= -18sin136/sin136 = -18
Tg(180*10)-sin(365+130)+cos(730+215)=tg0-sin(130)+cos(180+35)=
=-cos35-cos40=-(cos40+cos35)