A-10 Вариант 5 a) sin210°; 6) cos7π/6; 6) tg11π/4 sina, cos2a, если cosa=-5/13 и п<a<3π/2 sin β cos a+ sin(a-β)/tga 2 sin 2a – sin(π + a) + cos (3π/2-a)/1-sin(π/2-a)= -2 sin a cos 2a-sin(3π/2-a)+ cos²(π-a)/sin 2a-cos(π/2-a)=1/2 ctga sin 5x cos 3x = cos 5x sin 3x - 1 A-10 Вариант 7 a) sin225°; 6) cos5π/6; 6) tg150°. sina, cos2a, если cosa=-12/13 η π<α<3π/2 sin(α-β)+sin ẞ cos a/tga sin(3π + a) + cos (π/2-a) - 2 sin 2a/sin(3π/2+ a) + 1= 2 sin a