Основной период тангенса равен 180 градусов.
1)8cosπ/33*cos2π/33*cos4π/33*cos8π/33*
cos16π/33=(умножим делим sinπ/33)=
(8*cosπ/33*sinπ/33):(sinπ/33)*(cos2π/33*
cos4π/33)*cos8π/33*cos16π/33=
=4/(sinπ/33)*sin2π/33*cos2π/33*cos4π/33*
cos8π/33*cos16π/33=2/(sinπ/33)*sin4π/33*
cos4π/33*cos8π/33*cos16π/33=1/(sin2π/33)*
sin8π/33*cos8π/33*cos16π/33=1/(sinπ/33)*1/2*
sin16π/33*cos16π/33
1/(sinπ/33)*1/2*1/2sin32π/33=1/(sinπ/33)*1/4*
sin(π-32π/33)=1/(sinπ/33)*
1/4*sinπ/33=1/4
1) 16a^7 + 8a^3 = 8a^3(2a^4+1)
2) 3a(m-n) + b(n-m) = (m-n) × (3a-b)
3) ответ: = 2(m^2- n^2) - x^2 (m+n)
ba+bc+2a+2b, ну а если потом группировать то, b(a+c)+2a+2b=b(a+c)+2(a+c)=(a+c)(b+2)
2sin^2x-(1-sin^2x)-1=0
2sin^2x-1+sin^2x-1=0
3sin^2x-2=0
3sin^2x=2
sin^2x=2/3
sinx=2/3
x=(-1)^k•arcsin(2/3)+пn
sinx=(-2/3)
x=(-1)^k+1•arcsin(2/3)+пn