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Дано
$$frac{7 sin^{2}{left (a right )} + sin{left (a right )} cos{left (a right )}}{- sin{left (a right )} cos{left (a right )} + 4 cos^{2}{left (a right )}}$$
Подстановка условия
$$frac{7 sin^{2}{left (a right )} + sin{left (a right )} cos{left (a right )}}{- sin{left (a right )} cos{left (a right )} + 4 cos^{2}{left (a right )}}$$
(7*sin((3/2))^2 + sin((3/2))*cos((3/2)))/(4*cos((3/2))^2 – sin((3/2))*cos((3/2)))
$$frac{7 sin^{2}{left ((3/2) right )} + sin{left ((3/2) right )} cos{left ((3/2) right )}}{- sin{left ((3/2) right )} cos{left ((3/2) right )} + 4 cos^{2}{left ((3/2) right )}}$$
(7*sin(3/2)^2 + sin(3/2)*cos(3/2))/(4*cos(3/2)^2 – sin(3/2)*cos(3/2))
$$frac{sin{left (frac{3}{2} right )} cos{left (frac{3}{2} right )} + 7 sin^{2}{left (frac{3}{2} right )}}{- sin{left (frac{3}{2} right )} cos{left (frac{3}{2} right )} + 4 cos^{2}{left (frac{3}{2} right )}}$$
(7*sin(3/2)^2 + cos(3/2)*sin(3/2))/(4*cos(3/2)^2 – cos(3/2)*sin(3/2))
$$frac{sin{left (frac{3}{2} right )} cos{left (frac{3}{2} right )} + 7 sin^{2}{left (frac{3}{2} right )}}{- sin{left (frac{3}{2} right )} cos{left (frac{3}{2} right )} + 4 cos^{2}{left (frac{3}{2} right )}}$$
Численный ответ
(7.0*sin(a)^2 + cos(a)*sin(a))/(4.0*cos(a)^2 – cos(a)*sin(a))
Объединение рациональных выражений
$$frac{left(7 sin{left (a right )} + cos{left (a right )}right) sin{left (a right )}}{left(- sin{left (a right )} + 4 cos{left (a right )}right) cos{left (a right )}}$$
Общее упрощение
(1 + 7*tan(a))*sin(a)
———————
-sin(a) + 4*cos(a)
$$frac{left(7 tan{left (a right )} + 1right) sin{left (a right )}}{- sin{left (a right )} + 4 cos{left (a right )}}$$
Соберем выражение
$$- frac{sin{left (2 a right )}}{sin{left (2 a right )} – 4 cos{left (2 a right )} – 4} + frac{7 cos{left (2 a right )}}{sin{left (2 a right )} – 4 cos{left (2 a right )} – 4} – frac{7}{sin{left (2 a right )} – 4 cos{left (2 a right )} – 4}$$
Тригонометрическая часть
sin(2*a) 2
——– + 7*sin (a)
2
——————–
2 sin(2*a)
4*cos (a) – ——–
2
$$frac{7 sin^{2}{left (a right )} + frac{1}{2} sin{left (2 a right )}}{- frac{1}{2} sin{left (2 a right )} + 4 cos^{2}{left (a right )}}$$
Комбинаторика
(7*sin(a) + cos(a))*sin(a)
—————————
(-sin(a) + 4*cos(a))*cos(a)
$$frac{left(7 sin{left (a right )} + cos{left (a right )}right) sin{left (a right )}}{left(- sin{left (a right )} + 4 cos{left (a right )}right) cos{left (a right )}}$$