b) sin(a+b)-sin(a) * cos(b)
Упрощаем:
sin(a+b) = sin(a) cos(b) + cos(a) sin(b)
sin(a) cos(b) = sin(a) cos(b)
Подставляем значения:
sin(a+b) - sin(a) cos(b) = sin(a) cos(b) + cos(a) sin(b) - sin(a) cos(b) = cos(a) * sin(b)
Ответ: cos(a) * sin(b)
c) 2 - sin(a - π/4) - sin(a)
sin(a - π/4) = sin(a) cos(π/4) - cos(a) sin(π/4) = sin(a) (√2/2) - cos(a) (√2/2) = (√2/2) * (sin(a) - cos(a))
Подставляем значение:
2 - sin(a - π/4) - sin(a) = 2 - (√2/2) (sin(a) - cos(a)) - sin(a) = 2 - (√2/2) sin(a) + (√2/2) cos(a) - sin(a) = 2 - sin(a) + (√2/2) cos(a) - sin(a) = 2 + (√2/2) cos(a) - 2 sin(a)
Ответ: 2 + (√2/2) cos(a) - 2 sin(a)
b) sin(a+b)-sin(a) * cos(b)
Упрощаем:
sin(a+b) = sin(a) cos(b) + cos(a) sin(b)
sin(a) cos(b) = sin(a) cos(b)
Подставляем значения:
sin(a+b) - sin(a) cos(b) = sin(a) cos(b) + cos(a) sin(b) - sin(a) cos(b) = cos(a) * sin(b)
Ответ: cos(a) * sin(b)
c) 2 - sin(a - π/4) - sin(a)
Упрощаем:
sin(a - π/4) = sin(a) cos(π/4) - cos(a) sin(π/4) = sin(a) (√2/2) - cos(a) (√2/2) = (√2/2) * (sin(a) - cos(a))
Подставляем значение:
2 - sin(a - π/4) - sin(a) = 2 - (√2/2) (sin(a) - cos(a)) - sin(a) = 2 - (√2/2) sin(a) + (√2/2) cos(a) - sin(a) = 2 - sin(a) + (√2/2) cos(a) - sin(a) = 2 + (√2/2) cos(a) - 2 sin(a)
Ответ: 2 + (√2/2) cos(a) - 2 sin(a)