Дано: sin(a)^2+sin(b)^2-(sin(a)^2)*(sin(b)^2)+(cos(a)^2)*(cos(b)^2)
Решение:
1) (sin(a)^2)*(1-sin(b)^2)+sin(b)^2+(cos(a)^2)*(cos(b)^2)
где (sin(a)^2)*(1-sin(b)^2) = (sin(a)^2)*(cos(b)^2)
(sin(a)^2)*(cos(b)^2)+sin(b)^2+(cos(a)^2)*(cos(b)^2)
2) (cos(b)^2)*(sin(a)^2 + cos(a)^2) + sin(b)^2 = cos(b)^2 + sin(b)^2 = 1
Ответ: 1