Решить примеры (1-tg^2 75°)/(2tg75°)
sin 11π/7 cos 3π/7+sin 11π/7 cos 3π/7
sin(2x+π/4) sin(2x-π/4)+cos(2x+π/4) cos(2x-π/4)
sin 11π/7 cos 3π/7+sin 11π/7 cos 3π/7
sin(2x+π/4) sin(2x-π/4)+cos(2x+π/4) cos(2x-π/4)
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