А) ( 3-d)^2
Б) (4d+3)^2
В) (6b-5d)^2
Г) ((1/2)^2* d+ b)^2
Нарисуй координатную прямую 6см вправо 7 см влево 8 см вверх 7 см вниз и смотри по координатам точек
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
1) tg²(270°+a) = ctg² a
2) cos²(270°-a) = sin² a
3) sin²(180°-x) +sin²(270°-x) = sin²x+cos²x=1
4) cos²(180°+x) +cos²(90°+x) = cos²x+sin²x=1