Дано
$$cos{left (- a + pi right )} + cos{left (a + frac{3 pi}{2} right )} + sin{left (- a right )} cos{left (- a right )}$$
Подстановка условия
$$cos{left (- a + pi right )} + cos{left (a + frac{3 pi}{2} right )} + sin{left (- a right )} cos{left (- a right )}$$
cos(pi – (1/3)) + cos((3*pi)/2 + (1/3)) + cos(-(1/3))*sin(-(1/3))
$$cos{left (- (1/3) + pi right )} + cos{left ((1/3) + frac{3 pi}{2} right )} + sin{left (- (1/3) right )} cos{left (- (1/3) right )}$$
cos(pi – 1/3) + cos((3*pi)/2 + 1/3) + cos(-1/3)*sin(-1/3)
$$cos{left (- frac{1}{3} + pi right )} + cos{left (frac{1}{3} + frac{3 pi}{2} right )} + sin{left (- frac{1}{3} right )} cos{left (- frac{1}{3} right )}$$
-cos(1/3) – cos(1/3)*sin(1/3) + sin(1/3)
$$- cos{left (frac{1}{3} right )} – sin{left (frac{1}{3} right )} cos{left (frac{1}{3} right )} + sin{left (frac{1}{3} right )}$$
Степени
$$- sin{left (a right )} cos{left (a right )} + sin{left (a right )} – cos{left (a right )}$$
Численный ответ
cos(-a)*sin(-a) + cos(pi – a) + cos((3*pi)/2 + a)
Рациональный знаменатель
$$- sin{left (a right )} cos{left (a right )} + sin{left (a right )} – cos{left (a right )}$$
Объединение рациональных выражений
$$- sin{left (a right )} cos{left (a right )} – cos{left (a right )} + cos{left (frac{1}{2} left(2 a + 3 piright) right )}$$
Общее упрощение
sin(2*a) ___ / pi
– ——– – / 2 *cos|a + –|
2 4 /
$$- frac{1}{2} sin{left (2 a right )} – sqrt{2} cos{left (a + frac{pi}{4} right )}$$
Соберем выражение
$$sin{left (a right )} – frac{1}{2} sin{left (2 a right )} – cos{left (a right )}$$
/3*pi
cos(-a)*sin(-a) + cos(pi – a) + cos|—- + a|
2 /
$$sin{left (- a right )} cos{left (- a right )} + cos{left (- a + pi right )} + cos{left (a + frac{3 pi}{2} right )}$$
Общий знаменатель
cos(-a)*sin(-a) + cos(pi – a) + sin(a)
$$sin{left (- a right )} cos{left (- a right )} + sin{left (a right )} + cos{left (- a + pi right )}$$
Тригонометрическая часть
sin(2*a) ___ / pi
– ——– – / 2 *cos|a + –|
2 4 /
$$- frac{1}{2} sin{left (2 a right )} – sqrt{2} cos{left (a + frac{pi}{4} right )}$$
Комбинаторика
-cos(a) – cos(a)*sin(a) + sin(a)
$$- sin{left (a right )} cos{left (a right )} + sin{left (a right )} – cos{left (a right )}$$
Раскрыть выражение
-cos(a) – cos(a)*sin(a) + sin(a)
$$- sin{left (a right )} cos{left (a right )} + sin{left (a right )} – cos{left (a right )}$$