2) 5( a + b )^2/ ( a + b)^2 = 5/1 = 5
4) (q + 7)^2/ ((7-q)(7+q))^2 = q + 7\ (7 - q)^2
6) (c-4)(c+4)/(c-4)^2 = c + 4\ c - 4
8) c^2(a-b)(a+b)/x(a-b)^2 = c^2( a + b)\ x( a - b)
(tg2a-ctg2a)(tg2a+ctg2a)/4ctg4a=(tg2a-tg(π/2-2a))*(tg2a+tg(π/2-2a))/4ctg4a=
=sin(4a-π/2)*sin(4a+π/2)/cos2a*cos(π/2-2a)*cos2a*cos(π/2+2a(*4ctg4a=
=-cos4a*cos4a/cos²2a*sin2a*(-sin2a)*4ctg4a=cos²4a/sin²2a*cos²2a*4ctg4a=
=4ctg²4a/4ctg4a=ctg4a
(cosa-cos3a)/(1-cos2a) + (sina-sin3a)/sin2a=
=2sin2asina/2sin²a -2sinacos2a/2sinacosa=sin2a/sina - cos2a/cosa=
=(sin2acosa-cos2asina)/sinacosa=sina/sinacosa=1/cosa
Ответ:
решение на листке разберёшься надеюсь
1) 3+1=4
2) 1+1=2
Как-то так...