А) (6a+2b)^2 = 36a^2+16ab+4b^2
б) (<span>2x-5)^2= 4x^2- 14x+25
в) </span><span>(7a+2b)*(2b-7a)= 14ab-49a^2+4b^2-14ab= 4b^2-49a^2
г) </span><span>(2n^2+n)*(-2n^2+n)= -4n^4+ 2n^3- 2n^3+n^2= n^2-4n^4</span>
3x+4.5>(больше или равно) 0 3х>-4.5\3 x>-1.5
F(x)=5cosx;
f¹(x)=5·(-sinx)=-5sinx;
f¹(-3π/4)=-5·sin(-3π/4)=-5·(-sin(3π/4)=5·sin(π-π/4)=5·sinπ/4=5·√2/2;